On positive periodic solutions to second-order differential equations with a sub-linear non-linearity

Autor:	Lomtatidze, Alexander, Šremr, Jiří
Zdroj:	In Nonlinear Analysis: Real World Applications February 2021 57
Databáze:	ScienceDirect
Externí odkaz:	Zobrazit plný text záznamu Full Text from ScienceDirect