论文信息 - On periodic solutions of the system ·x = y − F(x), ·Y = −g(x)☆ - 字舞流文

On periodic solutions of the system ·x = y − F(x), ·Y = −g(x)☆

Peter J. Ponzo | Nelson Wax

[1] On the limit cycles of $$\ddot x + \mu \sin \dot x + x = 0$$ , 1967 .

[2] W. D. Evans,et al. PARTIAL DIFFERENTIAL EQUATIONS , 1941 .