1. Periodic solutions of asymptotically positively differential equations;Fonda;Differential Equations,1989
2. Certain classes of potentials for p - Laplacian to be non - degenerate;Zhang;Math Nachr,2005
3. Multiplicity results for periodic solutions of delay differential equations via critical point theory;Guo;Differential Equations,2005
4. Nonresonance conditions for asymptotically positively homogeneous differential systems : The Fucik spectrum and its generalization;Zhang;Differential Equations,1998
5. Periodic solutions for ordinary differential equations with sublinear impulsive effects;Qian;Math Anal Appl,2005