
Existence of Periodic Solutions for a Second Order Differential Equation with a Singularity of Indefinite Type
ZHU Yu
Acta Mathematicae Applicatae Sinica ›› 2019, Vol. 42 ›› Issue (4) : 433-441.
Existence of Periodic Solutions for a Second Order Differential Equation with a Singularity of Indefinite Type
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