delayed Duffing equations 时滞Duffing方程
superlinear Duffing equations 超线性Duffing方程
high order Duffing equations 高阶Duffing方程
strongly asymmetric Duffing equations 强不对称Duffing方程
Duffing differential equations Duffing方程
generalized Duffing-type equations 广义Duffing型方程
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