Tunç, C.Erdur, S.2025-05-102025-05-1020172518-42452-s2.0-85028325285https://hdl.handle.net/20.500.14720/234We investigated the existence of periodic solutions to a kind of non-linear differential equations of third order. We prove two new theorems on the existence of periodic solutions to the equation considered. The technique of proof involves the Leray-Schauder degree theory. The results obtained include and improve some results found in the literature. © Pakistan Academy of Sciences.eninfo:eu-repo/semantics/closedAccessExistence Of Periodic SolutionsNonlinear Differential EquationThird OrderArticle542N/AQ4207218