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  1. Periodic solution for ϕ-Laplacian neutral differential equation
  2. Existence of multiplicity harmonic and subharmonic solutions for second-order quasilinear equation via Poincaré-Birkhoff twist theorem
  3. Positive solutions for fourth-order singular nonlinear differential equation with variable-coefficient
  4. Multiplicity results of positive solutions for fourth-order nonlinear differential equation with singularity