具不对称非线性项的二阶常微分方程周期解的存在性

张小美;钱定边

Existence of Periodic Solutions for Second Order Differential Equations with Asymmetric Nonlinearity

Xiao Mei ZHANG(1),Ding Bian QI

数学学报 . 2003, (5): 1017 -102 . DOI: 10.12386/A2003sxxb0135