duffing equation meaning in English

达芬方程
杜芬方程

Periodic solution for a class of duffing equations
一类高阶时滞微分方程的周期解
Existence of periodic solutions of generalized duffing equation
方程周期解的存在性
Periodic solution for a class of duffing equations with delay
一类时滞微分方程的周期解
Exact multiple results of duffing equation
方程的唯三周期解问题
Boundedness of solutions for duffing equations with asymmetric superlinear restoring terms
方程解的有界性

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