OOIR: Observatory of International Research

Papers

(The TQCC of Electronic Journal of Qualitative Theory of Differential Equations 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
Complex oscillations of non-definite Sturm-Liouville problems, II	14
Biharmonic system with Hartree-type critical nonlinearity	7
Global boundedness in a quasilinear predator–prey chemotaxis system with nonlinear indirect signal production	6
Expansion of positivity to a class of doubly nonlinear parabolic equations	6
Multiplicity of solutions for p ( x 5
Multiple nonsymmetric nodal solutions for quasilinear Schrödinger system	3
Ground states solutions for some non-autonomous Schrödinger-Bopp-Podolsky system	3
Symmetric nonlinear solvable system of difference equations	3
On the localization and numerical computation of positive radial solutions for ϕ -Laplace equations in t	3
Two regularity criteria of the 3D magneto-micropolar equations in Vishik spaces	3
Bifurcations and Turing patterns in a diffusive Gierer–Meinhardt model	3
Critical points of locally Lipschitz functionals inside and outside the ordered interval	3
Semilinear heat equation with singular terms	2
Sharp results for oscillation of second-order neutral delay differential equations	2
Rational solutions and limit cycles of polynomial and trigonometric Abel equations	2
Positive solutions for a class of concave-convex semilinear elliptic systems with double critical exponents	2
Global boundedness and stabilization in a predator-prey model with cannibalism and prey-evasion	2
Rational limit cycles of Abel differential equations	2
Infinitely many solutions for an anisotropic differential inclusion on unbounded domains	2
Existence and nonexistence of solutions for generalized quasilinear Kirchhoff–Schrödinger–Poisson system	2
Global attractivity of a higher order nonlinear difference equation with decreasing terms	2
Ground-state solutions of a Hartree–Fock type system involving critical Sobolev exponent	2
On the logarithmic fractional Schrödinger–Poisson system with saddle-like potential	2
Prolongation of solutions and Lyapunov stability for Stieltjes dynamical systems	2
On a special case of a difference equation with powers	2

Positive solutions to three classes of non-local fourth-order problems with derivative-dependent nonlinearities	2
Strong maximum principle for a sublinear elliptic problem at resonance	2
Oscillation of half-linear differential equations with mixed type of argument	2
On the kernel of the Stieltjes derivative and the space of bounded Stieltjes-differentiable functions	2
Normalized solutions for Kirchhoff-type equations with combined nonlinearities: the L	2
On a Dirichlet boundary value problem for an Ermakov–Painlevé I equation. A Hamiltonian EPI system	2
On some differential equations involving a new kind of variable exponents	2
Normalized solutions for a fractional coupled critical Hartree system	2
Topological dimensions of random attractors for a stochastic reaction-diffusion equation with delay	2
Multiple positive solutions for a fractional Kirchhoff type equation with logarithmic and singular nonlinearities	2
New stability criteria for periodic planar Lotka–Volterra systems	2
Existence and multiplicity of eigenvalues for some double-phase problems involving an indefinite sign reaction term	2
Global bifurcation curves of nonlocal elliptic equations with oscillatory nonlinear term	2
Homoclinic solutions for a class of asymptotically autonomous Hamiltonian systems with indefinite sign nonlinearities	2
The existence of solutions for the modified ( p ( x	2
Global dynamics on a class of age-infection structured cholera model with immigration	1
Multiple normalized solutions for ( 2 , q )<	1
Ulam–Hyers stability and exponentially dichotomic equations in Banach spaces	1
Ground state sign-changing solutions for critical Choquard equations with steep well potential	1
The blow-up method applied to monodromic singularities	1
On the analytic commutator for Λ−Ω differential systems	1
Study of singular elliptic equations with mixed boundary conditions and nonlocal source terms	1
Positive solutions for concave-convex type problems for the one-dimensional ϕ -Laplacian	1
Convergence of weak solutions of elliptic problems with datum in L 1	1
Decreasing solutions of cyclic second-order difference systems	1
Existence and uniqueness of solutions of a fourth-order boundary value problem with non-homogeneous boundary conditions	1
Schrödinger–Hardy system without the Ambrosetti–Rabinowitz condition on Carnot groups	1
On a solvable class of nonlinear difference equations of fourth order	1
Multiplicity of solutions of Kirchhoff-type fractional Laplacian problems with critical and singular nonlinearities	1
Linearized instability for differential equations with dependence on the past derivative	1
On oscillation of solutions of scalar delay differential equation in critical case	1
Existence of positive solutions of elliptic equations with Hardy term	1
Dynamics analysis of a diffusive prey-taxis system with memory and maturation delays	1
On uniform asymptotic h -stability for li	1
New oscillation criteria for third order nonlinear functional differential equations	1
Existence and regularity of pullback attractors for a 3D non-autonomous Navier–Stokes–Voigt model with finite delay	1
Optimal C	1
Systems of second order Stieltjes differential equations with three-point boundary conditions	1
Addendum to Higher order stroboscopic averaged functions: a general relationship with Melnikov functions	1
Positive solutions of a Kirchhoff–Schrödinger--Newton system with critical nonlocal term	1
Unilateral global bifurcation for an overdetermined problem in	1
Limit cycles of planar piecewise linear Hamiltonian differential systems with two or three zones	1
Existence of solution for a generalized Schrödinger–Poisson system via bifurcation theory	1
Slow divergence integral in regularized piecewise smooth systems	1
Stability results for the functional differential equations associated to water hammer in hydraulics	1
Weighted L p -type regularity estimates for nonlinear parabolic equations with O	1
A study on the oscillation of second-order neutral differential equations in noncanonical form	1
The family of cubic differential systems with two real and two complex distinct infinite singularities and invariant straight lines of the type	1
Periodic and bounded solutions of functional differential equations with small delays	1
Addendum to ``Ulam–Hyers stability and exponentially dichotomic equations in Banach spaces'' [Electron. J. Qual. Theory Differ. Equ. 2023, No. 8, 1–10]	1

Solvability of thirty-six three-dimensional systems of difference equations of hyperbolic-cotangent type	1
Configurations of quadratic systems possessing three distinct infinite singularities and one or more invariant parabolas	1
Existence and regularity of solutions for a singular anisotropic ( p , q	1
Multiple solutions for a fractional ( p	1
Periodic solutions in a linear delay difference system	1
Normalized solutions for Schrödinger equations with potential and general nonlinearities involving critical case on large convex domains	1
Multiple solutions for a class of Kirchhoff-type equation with critical growth	1
Weak center for a class of Λ –	1
Sobolev inequality with non-uniformly degenerating gradient	1
Sign-changing solution for critical Schrödinger–Poisson system with concave perturbation	1
Existence of normalized solutions for the nonlinear Schrödinger–Poisson–Boltzmann system	1
Some results concerning a system of two max difference equations	1
Normal forms for retarded functional differential equations associated with zero-double-Hopf singularity with 1 :	1
Theodore A. Burton (1935–2025)	1
An implicit system of delay differential algebraic equations from hydrodynamics	1
Existence and exponential stability of periodic solutions of Nicholson-type systems with nonlinear density-dependent mortality and linear harvesting	1
Nonlinear integral inequalities involving Ψ -Hilfer fractional integrals and iterated fractional inte	1
Isolated periodic wave trains in a generalized Burgers–Huxley equation	1