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29.
On the Sufficient Conditions for the Existence of Limit Cycles of the System dx/dt=y,dy/dt=Σbijxiyj
黄克成
数学学报(英文版)
1985, 1 (3):
255-260.
DOI: 10.1007/BF02564822
In the theory of oscillations, it is needed to discuss whether the nonlinear differential equation
d2x/dt2+f(x,dx/dt)dx/dt+g(x)=0 (A)
has perxodic solutions.
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