OOIR: Observatory of International Research

Papers

(The median citation count of Metrologia is 1. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2022-01-01 to 2026-01-01.)

Article	Citations
Adoption of ICRU report 90 recommendations in the Canadian Co-60 air-kerma primary standard	108
Key comparison CCQM-K179 - polar analyte in solid organic material: mass fraction of oxytetracycline hydrochloride salt	36
Corrigendum: Detection and identification of faults in clock ensembles with the generalized likelihood ratio test (2022 Metrologia 59 045010)	29
SIM supplementary comparison on calibration of conventional mass of a 20 kg weight	22
Report on EURAMET supplementary comparison on measurement of a 1 mm stage micrometer	21
Final report of the supplementary comparison between NIMT and LNE on pressure standards in the range 50 MPa to 500 MPa of hydraulic gauge pressure	21
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with EMPA, June 2023	20
Update of the BIPM comparison BIPM.RI(II)-K1.Ga-67 of activity measurements of the radionuclide ⁶⁷Ga to include the 2023 result of the CMI (Czechia)	19
Calibration of gauge blocks by optical interferometry comparison - final report	18
Key comparison of voltage unit standards based on the Josephson effect	17
Final report on the EURAMET key comparison EURAMET AUV.V-K5	17
Comparison of calibration of multimeter	17
Report of the CCRI(II) supplementary international comparison of measurement of activity per unit mass of Cs-134 and Cs-137 in wheat flour (CCRI(II)-S13)	17
SIM Thermocouple Type S Supplementary Comparison	17
Reply to Comment on ‘The Avogadro constant is not the defining constant of the mole’	16
Bilateral Comparison of AC Programmable Josephson Voltage Standard (0.75 V rms and 7 V rms) between the PTB (Germany) and the BIPM, June 2025 (part of the ongoing BIPM key comparison BIPM.EM-K10.c a	16
Measurement of melting and freezing temperature of iron using radiation thermometry	15
CCQM-K68.2019, nitrous oxide (N₂O) in air, ambient level, final report	14
Final report of CCQM-K96.2023: assay of potassium dichromate	14
Absolute frequency measurement of a Lu⁺ (³D₁) optical frequency standard via link to international atomic time	14
Key comparison BIPM.RI(I)-K2 of the air-kerma standards of the BFKH, Hungary, and the BIPM in low-energy x-rays	14
Relating SI units to the ‘defining constants’	13
Final report of APMP.AUV.V-S1: supplementary comparison on calibration of laser tachometers using mechanical generators	13
Comparison of low air speed facilities	13
Characterization of the LED filament lamp for luminous intensity calibration	13

Bilateral Comparison of 1.018 V and 10 V Standards between the SMD (Belgium) and the BIPM, October to December 2021 (part of the ongoing BIPM key comparison BIPM.EM-K11)	13
Final Report on key comparison EURAMET.M.P K4.2020 in the range from 1 Pa to 15 kPa of absolute and gauge pressure	13
Update of the BIPM comparison BIPM.RI(II)-K1.Sn-113 of activity measurements of the radionuclide ¹¹³Sn to include the 2017 result of the LNE-LNHB (France)	12
APMP key comparison of AC-DC current transfer standards: final report	12
Comparison between four integer ambiguity resolved PPP GNSS time transfer software solutions	12
Detection and identification of faults in clock ensembles with the generalized likelihood ratio test	12
Report on comparison EURAMET.M.M-S10 (comparison of sub-multiples of the kilogram)	12
Bilateral comparison of 1 Ω and 10 kΩ standards (ongoing BIPM key comparison BIPM.EM-K13) between the NPLI (India) and the BIPM	12
Comparison in dynamic primary calibration of digital-output accelerometer between CEM and PTB	11
Corrigendum: Uncertainty of the measurement of the frequency dependence of four-terminal pair capacitance with a four-channel vector network analyzer (2025 Metrologia 62 025011)	11
Report on the APMP key comparison of hydrometer calibrations APMP.M.D-K4	11
CIPM key comparison of viscosity CCM.V-K4	11
Determining the calibration factor of Rn-220 by low-pressure scintillation cell	11
Economic optimization of acceptance interval in conformity assessment: 1. Process with no systematic effect	10
Key comparison BIPM.RI(I)-K5 of the air-kerma standards of the GUM, Poland and the BIPM in ¹³⁷Cs gamma radiation	10
Discussion on the calculation of the uncertainties of [UTC-UTC(k)]	10
Key comparison BIPM.RI(I)-K7 of the air-kerma standards of the BFKH, Hungary, and the BIPM in mammography x-rays	10
Autocollimators: plane angle measurand ambiguities and the impact of surface form	9
EURAMET.M.FF-S13 final report	9
Comparison of blackbody for clinical infrared ear thermometers	9
NTSC SrII optical lattice clock with uncertainty of 2	9
Series connection of quantum Hall resistance array and programmable Josephson voltage standard for current generation at one microampere	9
CCM.G-K2.2023: CIPM key comparison of absolute gravimeters	9
International Comparison CCQM-K10.2018.1 - BTEX gas mixtures	9
High polarity analyte(s) in aqueous media: Determination of L-PFOA and L-PFOS in ground water	8
The unusual status of the hectare in the SI	8
The irony of the magnet system for Kibble balances—a review	8
Key comparison CCQM-K148.b - polar analyte in solid organic material: mass fraction of oxytetracycline	8
High precision roundness measurement by error separation techniques (EURAMET.L-S30)	8
Traceable characterisation of fibre-coupled single-photon detectors	7
Machine learning based priors for Bayesian inversion in MR imaging	7
Gas viscosities from a semiconductor-manufacturing mass-flow controller	7
Phase shifting angle interferometer	7
A proposal for three categories of units within the SI	7
Final report for CCQM-P212: coherence of carbon isotope delta reference materials	7
Achievement of 0.005% combined transfer uncertainties in the NIST detector calibration facility	7
Final report on key comparison APMP.M.P-K7.2 in hydraulic gauge pressure from 10 MPa to 100 MPa	7
Measurement model of circadian action factor of phosphor-converted white LEDs based on photometric, electrical, and thermal properties	7
Final report on the supplementary comparison EURAMET.AUV.V-S2	7
The forgotten (?) potentiometric method in thermometry	7
Key comparison CCEM.RF-K27.W of RF power from 50 GHz to 75 GHz in rectangular waveguide	6
Dual-mode room temperature self-calibrating photodiodes approaching cryogenic radiometer uncertainty	6
Ambient humidity, the overlooked influencer of radioactivity measurements	6
Bilateral comparison of 10 pF and 100 pF standards (ongoing BIPM key comparisons BIPM.EM-K14.a and 14.b) between the NMIM (Malaysia) and the BIPM	6
Room temperature dual-mode internal quantum deficiency measurement with propagated uncertainty to 0.03% (k = 2)	6
Reply to Second Comment on ‘The Avogadro constant is not the defining constant of the mole’	6
Evaluation of the transportable atom gravimeter HUST-QG	6
Accurate characterisation of optical diffuse transmission—primary facility and extension to translucent samples	6
Update of the BIPM comparison BIPM.RI(II)-K1.Co-57 of activity measurements of the radionuclide ⁵⁷Co to include the 2023 result of the BEV (Austria)	5
Bilateral comparison in torque transducer calibration between CENAM, Mexico and CEM, Spain, SIM.M.T-S1	5

Final report on the CCM key comparison of kilogram realizations CCM.M-K8.2021	5
Accurate density measurement of a small solid sample using a combination of hydrostatic weighing and pressure-of-flotation methods	5
A proposal to change the leap-second adjustments to coordinated universal time	5
Measurement science meets the reproducibility challenge	5
Power of a test for assessing interlaboratory consensus of nominal and ordinal characteristics of a substance, material, or object	5
Report on APMP key comparison: calibration of line scale (APMP.L-K7)	5
Method for traceable calibration of 5G NR measuring receivers	5
Continuous GPS PPP-AR frequency transfer links	5
Erratum: Metrological characterization of a commercial single-photon source with high photon flux emission (2024 Metrologia 61 054001)	5
Comparison of PLTS-2000 and the magnetic field fluctuation thermometer at LNE-Cnam	5
Linkage for Metrosert to CCT-K9 via the EURAMET-T.K9.1 bilateral comparison	5
Evaluations of the decay data of ⁵⁷ Co, ⁷⁶ Br, ^133m	5
Multi-taper-based automatic correction of non-anechoic antenna measurements	5
A new interpolation equation in the ITS-90 subrange from the triple point of water to the freezing point of indium	5
Precise high resistance comparison between the NMIJ traveling dual source bridge and the NIST adapted Wheatstone bridge	5
Final report, On-going Key Comparison BIPM.QM-K1, Ozone at ambient level, comparison with NIM Oct.2023	5
Key comparison BIPM.RI(I)-K8 of high dose-rate ¹⁹²Ir brachytherapy standards for reference air kerma rate of the NIM and the BIPM	4
Key comparison study - organic solvent calibration solution - gravimetric preparation and value assignment of deoxynivalenol (DON) in acetonitrile (ACN)	4
Lunar Reference Timescale	4
International comparison CCQM-K165: dimethyl sulfide in nitrogen at 5 nmol mol^-1	4
Calibration of GNSS stations for UTC	4
Pilot study CCQM-P172 – spectroscopic methods for HNO₃ value assignment	4
AFRIMETS.AUV.A-S2 final report, calibration of a multi-function acoustic calibrator	4
APMP key comparison of luminous intensity (APMP.PR-K3.a): final report	4
CIPM key comparison CCPR-K1.a.2017 for spectral irradiance 250 nm to 2500 nm. Final report	4
Final report on EURAMET key comparison EURAMET.M.D-K2.2 (1523)	4
Bilateral comparison of 1.018 V and 10 V standards between CSIR-NPL (India) and the BIPM, April to June 2022 (part of the ongoing BIPM key comparison BIPM.EM-K11.a and b)	4
Bilateral comparison of irradiance scales between PMOD/WRC and PTB for longwave downward radiation measurements	4
A Bayesian statistical method for large-scale MEMS-based sensors calibration: a case study on 100 digital accelerometers	4
Activity measurements of the radionuclides ^99mTc, ¹⁸F and ⁶⁴Cu for the POLATOM, Poland, in the ongoing comparisons BIPM.RI(II)-K4 series and KCRV update in the corres	4
Continuous IPPP links for UTC	4
Key comparison COOMET.QM-K120 "Carbon dioxide in air at urban level (480–800) μmol/mol"	4
Key comparison BIPM.RI(I)-K4 of the absorbed dose to water standards of the NMIJ, Japan, and the BIPM in ⁶⁰Co gamma radiation	4
Measurement method of the solar diffuser bidirectional reflectance distribution function in the short-wave infrared band	4
Assay of sodium carbonate	4
Report on the key comparison, CCM.F-K23 in force at 200 N and 500 N	4
Final report on the CCM key comparison of density measurements of a silicon sphere (1 kg) by hydrostatic weighing (CCM.D-K1.2023)	4
International comparison CCQM-K3.2019 automotive exhaust gases	4
Final report on the APMP regional comparison of type R thermocouples calibration at Cu, Co-C and Pd fixed points, APMP.T-S16	4
Key comparison BIPM.RI(I)-K5 of the air-kerma standards of the BEV, Austria and the BIPM in ¹³⁷Cs gamma radiation	4
First evaluation of the primary frequency standard NTSC-CsF2	4
Gonioreflectometer for measuring 3D spectral BRDF of horizontally aligned samples with traceability to SI	4
Precision control of resistive power in Kibble balance coils: an advanced method for minimizing temperature-related magnetic errors	4
Precision measurement of an electron pump at 2 GHz; the frontier of small DC current metrology	4
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with NIST, July 2022	4
Final report of SIM supplementary comparison on testing machine calibration in compression up to 100 kN.	4
Report of the comparison BIPM.QM-K2.b, on carbon dioxide in nitrogen at ambient levels, with E+ E Elektronik (2025)	4
Comparison BIPM.RI(I)-K6 of the standards for absorbed dose to water of the NRC, Canada and the BIPM in accelerator photon beams	4
CCQM-P206, nitrous oxide (N₂O) in air, ambient level, pilot study run in parallel with CCQM-K68.2019	4
Supplementary comparison for the traceability of AC high voltage reference measuring systems up to 200 kV (EURAMET.EM-S33)	4
Spectrophotometer-employed method for measuring luminous transmittance and haze	3
Properties of a definition of the SI second based on several optical transitions	3
Measurement of average mass attenuation coefficient of air for ¹³⁷Cs gamma-ray irradiation beam	3
Key comparison study on peptide purity - glycated hexapeptide of HbA1c	3
Comparison of methods to determine the fluence of monoenergetic neutrons in the energy range from 30 keV to 14.8 MeV	3
Phase-stepping interferometry for parallelism measurement of step gauge faces	3
Final report on key comparison APMP.AUV.A-K5	3
What is measurement uncertainty? A discussion ^*	3
Method to traceably determine the refractive index by measuring the angle of minimum deviation	3
Bilateral supplementary comparison of high voltage transformer measuring systems	3
Extension to the range of prefixes for binary multiples	3
Calibration of a step gauge (APMP.L-K5.n01)	3
Key comparison BIPM.RI(I)-K2 of the air-kerma standards of the GUM, Poland, and the BIPM in low-energy x-rays	3
An assessment of the ageing of the absolute spectral responsivity of trap detectors at krypton ion laser emission wavelengths	3
Comment on ‘On the dimension of angles and their units’	3
Developing calibration and measurement capabilities for atmospheric CH₄ stable isotope ratios at NMIs/DIs: metrology for global comparability	3
A two-capillary viscometer for temperatures up to 473 K and pressures up to 100 MPa—operation and verification at low pressure	3
Final report of CCQM-K157 for the measurement of the amount of substance of HfO₂ expressed as the thickness of nm films	3
Practical realisation of the kelvin by Johnson noise thermometry	3
Bilateral key comparison EURAMET.EM-K11.1 "AC-DC Voltage Transfer Difference at Low Voltages"	3
Final report of CCQM-K96.2023.1: assay of potassium dichromate	3
Comparison of primary standards for liquid flow - flow range (0.1 to 10) µL/min	3
Reply to Comment on ‘On the dimension of angles and their units’	3
Experimental determination and Monte Carlo validation of ²²⁵ Ac absorbed dose	3
Analysis of reproducibility by using inclusive and exclusive statistics in the framework of a bilateral comparison	3
Torque euramet supplementary comparison EURAMET.M.T-S4 (Euramet Project 1304) from 0.1 N·m to 5 N·m and from 5 N·m to 50 N·m	3
Final report "Key comparison CCM.FF-K1.2015 - water flow: 30 m³/h ... 200 m³/h"	3
Final report of CCQM-P204, comparison on CO₂ isotope ratios in pure CO₂	3
New impedance bridge at LNE for the two terminal-pair AC resistor calibration up to 20 kHz	3
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with CMS/ITRI, March 2024	3

Key comparisons of air kerma and absorbed dose to water standards in ⁶⁰Co radiation beam (EURAMET.RI(I)-K1.3 and EURAMET.RI(I)-K4.3)	3
Activity measurements of the radionuclides ¹⁸F, ⁶⁴Cu and ^99mTc for the ANSTO, Australia, in the ongoing comparisons BIPM.RI(II)-K4 series and KCRV update in the corre	3
Calibration of an ionisation chamber for parent–progeny decay	3
A constant pressure flowmeter for extreme-high vacuum	3
Advancements in the NRC-FCs2 primary frequency standard	3
Comparison of standards for the calibration of stopwatches	3
Measurement of the intrinsic sensitivity for a single-ended accelerometer without the influence of the mounting condition	3
GPS PPP-AR frequency transfer and its application for comparing atomic fountain primary frequency standards between NRC and PTB	3
International Comparison CCQM-K175 - Hydrogen chloride in nitrogen	3
Key comparison BIPM.RI(I)-K1 of the air-kerma standards of the KRISS, Republic of Korea and the BIPM in ⁶⁰Co gamma radiation	3
Comparison report between NIM and CMS of the ITS-90 realization at the triple point of argon	3
Long-term stability of molecular doped epigraphene quantum Hall standards: single elements and large arrays (R _K/236 ≈ 109 Ω)	3
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with INRIM, February 2022	3
Force Key Comparison CCM.F-K2.a.2 - Final Report	3
AFRIMETS supplementary comparison on pin gauges	3
High polarity analyte(s) in aqueous media: determination of L-PFOA and L-PFOS in ground water	2
Evaluation of the relativistic redshift in frequency standards at KRISS	2
Update of the BIPM comparison BIPM.RI(II)-K1.Ba-133 of activity measurements of the radionuclide ¹³³Ba to include the 2016 result of the NRC (Canada), the 2018 result of the TENMAK-NÜKEN (T	2
ITS-90 SPRT calibration from the Ar TP to the Zn FP	2
Traceable spectral interferometry for length measurement	2
Results of the CCRI(II)-S16.Lu-177 International Supplementary Comparison of the Activity Measurements of a Solution of ¹⁷⁷Lu	2
Bilateral comparison of 1.018 V and 10 V standards between INRIM (Italy) and the BIPM, November to December 2023 (part of the ongoing BIPM key comparison BIPM.EM-K11.a and b)	2
CCQM-K158 elements and inorganic arsenic in rice flour	2
Comparison of partial discharge (PD) calibrators from 0.1 pC to 10 nC	2
A robust time scale for space applications using the student’s t-distribution	2
Thermodynamic effects in a gas modulated Invar-based dual Fabry–Pérot cavity refractometer	2
Bilateral comparison of 10 kΩ standards (ongoing BIPM key comparisons BIPM.EM-K13.b) between UME and the BIPM.	2
Evaluation of the long-term reproducibility of a realization of the kilogram by the XRCD method	2
Final report, on-going key comparison BIPM.QM-K1, ozone at ambient level, comparison with NIMT, September 2022	2
Uncertainty analysis of MSL’s CCT-K7.2021 key comparison measurements taking account of correlations	2
EURAMET supplementary comparison EURAMET.L-S26.1, measurement of groove depth standards in the range 5 μm up to 0.9 mm	2
Calibration of angle standards	2
Realisation of the kilogram with the XRCD method – improved XRF evaluation and its impact	2
Update of the BIPM comparison BIPM.RI(II)-K1.Ge-68 of activity measurements of the radionuclide ⁶⁸Ge to include the 2021 result of the NIM (China)	2
Speedy in-situ magnetic field compensation algorithm for multiple-channel single-beam SERF atomic magnetometers	2
International comparison CCQM-P229 pilot study to measure line intensities of selected ¹²C¹⁶O transitions	2
Phase transition behavior of pure Fe cells for thermocouple calibration	2
Supplementary comparison CCRI(I)-S3 of standards for absorbed dose to water in ⁶⁰Co gamma radiation at radiation processing dose levels	2
APMP supplementary international comparison of activity measurement of Cs-134 and Cs-137 in brown rice	2
SIM.T-K9.3: Standard platinum resistance thermometer ITS-90 realizations from the Hg triple point to the Zn freezing point	2
Subsequent bilateral key comparison study - organic solvent calibration solution - gravimetric preparation and value assignment of aflatoxin B1 (AfB1) in acetonitrile (ACN)	2
APMP.QM-S19: Toxic elements in seafood	2
Iodine frequency-stabilized HeNe laser amplified by injection locking of a semiconductor laser diode	2
CCQM-K176 breast cancer biomarker HER2 copy number variation (CNV) measurement	2
Final report on CCQM-K167: carbon isotope delta measurements of vanillin	2
Absolute frequency measurement of the ⁸⁷Sr optical lattice clock at NTSC using international atomic time	2
A test of measurement results with increased sensitivity to inconsistency	2
Noise-induced servo errors in optical clocks utilizing Rabi interrogation	2
Measurement of bidirectional transmittance distribution function in the visible and near-infrared spectral range	2
Calibration of the microphone sensitivity below 0.5 Hz using the liquid-column-type sound pressure generator	2
Bilateral comparison of 10 pF and 100 pF standards (ongoing BIPM key comparisons BIPM.EM-K14.a and 14.b) between the CENAM (Mexico) and the BIPM	2
PAWG pilot study on quantification of total haemoglobin in blood	2
Update of the BIPM comparison BIPM.RI(II)-K1.Mn-54 of activity measurements of the radionuclide ⁵⁴Mn to include the 2024 result of the POLATOM (Poland)	2
The isotopic composition of the new enriched silicon crystal Si28-31Pr11: maintaining the realization and dissemination of the mole and the kilogram via the XRCD method	2
COOMET key comparison COOMET.PR-K1.a.2018 for spectral irradiance 250 nm to 2500 nmm, final report	2
FINAL REPORT OF SIM SUPPLEMENTARY COMPARISON ON TESTING MACHINE CALIBRATION IN COMPRESSION UP TO 100 kN	2
Electron paramagnetic resonance study of silicon-28 single crystal for realization of the kilogram	2
Update of the BIPM comparison BIPM.RI(II)-K1.Tl-201 of activity measurements of the radionuclide ²⁰¹Tl to include the 2011 result of the NIST (United States)	2
Characterization of the collisional frequency shift in an atomic fountain clock using absorption imaging	2
A metrological framework for uncertainty evaluation in machine learning classification models	2
Bilateral comparison of 1.018 V and 10 V standards between DEFNAT (Tunisia) and the BIPM, April to June 2022 (part of the ongoing BIPM key comparison BIPM.EM-K11.a and b)	2
Characterization of laser-pumped Cs-⁴He atomic magnetometer	2
AFRIMETS supplementary comparison on calibration of dial gauge	2
Primary calibration for airborne infrasound utilizing the vertical gradient of the ambient pressure	2
On modelling of artefact instability in interlaboratory comparisons	2
Elements in lipstick material	2
Calibration of two mass standards with the LNE Kibble balance in 2024	2
Comparison BIPM.RI(I)-K6 of the standards for absorbed dose to water of the ARPANSA, Australia, and the BIPM in accelerator photon beams	2
Supplementary comparisons of national standards of ratio error and phase displacement of AC voltage of power frequency COOMET 411/RU-a/07 (COOMET.EM-S6)	2
Repeatability of a primary thermometer and calibration of resistance thermometers between 5 K and 25 K	2
A three-cornered hat analysis of instabilities in two-way and GPS carrier phase time transfer systems	2
Impact study of numerical discretization accuracy on parameter reconstructions and model parameter distributions	2
EURAMET.T-K9 regional key comparison ITS-90 SPRT calibration from the Ar TP to the Zn FP	2
Key comparison BIPM.RI(I)-K8 of high dose-rate ¹⁹²Ir brachytherapy standards for reference air kerma rate of the VSL and the BIPM	2
Evaluating the effect of wavefront aberrations in an atom gravimeter^*	2
Report of subsequent key comparison CCQM - K73.2018.2 amount content of H+ in hydrochloric acid (0.1 mol/kg-1)	2
EURAMET Key Comparison EURAMET.M.D-K4.2020: Hydrometer calibration comparison from 600 kg/m³ to 2000 kg/m³	1
Final report, ongoing key comparison BIPM.QM-K1, ozone at ambient level, comparison with UNAL-CALAIRE (November 2023)	1
Comment on ‘A proposal to change the leap-second adjustments to UTC’	1
Bilateral comparison in high gauge pressure 250 MPa	1
APMP.M.H-S5 final report of the supplementary comparison of Brinell hardness	1
CCQM-K161 "Anions in Seawater"	1
COOMET regional comparison of the national standards of air kerma for x-radiation qualities used for radiation protection and diagnostic radiology (COOMET.RI(I)-S3)	1
Supplementary comparison of national standard instruments in the field of magnetic flux density and magnetic flux measurements by sensing coils	1
Conversion of a piston–cylinder dimensional dataset to the effective area of a mechanical pressure generator	1
Instrumentation and uncertainty evaluation for absolute characterization of thin films and nanostructured surfaces in advanced optical metrology	1
Supplementary comparison of gas provers in the gas flow range 0.25 m³/h to 25 m³/h	1
Key comparison BIPM.RI(I)-K1 of the air-kerma standards of the NMIJ, Japan and the BIPM in ⁶⁰Co gamma radiation	1
Absolute frequency measurement of an Al	1
Economic optimization of acceptance interval in conformity assessment: 2. Process with unknown systematic effect	1
Statistics for quantifying aging in time transfer system delays	1
Traceable methods for calibrating condensation particle counters at concentrations down to 1 cm⁻³	1
Traceability for nuclear medicine: the status of primary radioactivity standards	1
Key comparison study on peptide purity - hexapeptide of HbA0	1
Bilateral key comparisons of dew point temperature standards of national metrological institutes	1