一类非自治共振二阶系统的多重周期解

张环环

Multiplicity of Periodic Solution of a Class of Non-Automous Second Order System at Resonance

ZHANG Huan-Huan

journal6 . 2015, (5): 16 -20 . DOI: 10.3969/j.cnki.jdxb.2015.05.004