International Journal of Mathematics and Mathematical Sciences 
Volume 24 (2000), Issue 1, Pages 67-71
doi:10.1155/S0161171200003185

Periodic solutions of nonlinear differential equations

Xiaojing Yang

 Department of Mathematics, Tsinghua University, Beijing, China
Received 26 March 1999

Abstract

The periodic boundary value problems of a class of nonlinear differential equations are investigated.