Periodic solutions of perturbed isochronous hamiltonian systems at resonance

Boundary-value problems for weakly nonlinear ordinary differential equations

E. N. Dancer · Bulletin of the Australian Mathematical Society · 1976 · 111 citations · Full text

Natural Sciences, Mathematics, Differential Equations +14

Roots of Unity and Unbounded Motions of an Asymmetric Oscillator

José M. Alonso, Rafael Ortega · Journal of Differential Equations · 1998 · 96 citations

Natural Sciences, Mathematics, Differential Equations +13

Boundedness in Asymmetric Oscillations

Bin Liu · Journal of Mathematical Analysis and Applications · 1999 · 78 citations

Natural Sciences, Mathematics, Physics +11

Landesman-Lazer Conditions for Periodic Boundary Value Problems with Asymmetric Nonlinearities

C. Fabry · Journal of Differential Equations · 1995 · 70 citations

Natural Sciences, Mathematics, Physics +12

Nonlinear Resonance in Asymmetric Oscillators

Christian Fabry, Alessandro Fonda · Journal of Differential Equations · 1998 · 69 citations

Natural Sciences, Physics, Differential Equations +10