Biçer, E.Tunç, C.2025-05-102025-05-1020150377-29692-s2.0-84925435237https://hdl.handle.net/20.500.14720/151In this paper, on the basis of Krasnoselskii’s fixed point theorem, sufficient conditions are derived for the existence of periodic solutions to certain nonlinear neutral differential equations of first order with multiple retarded arguments. Our results extend and improve some related ones in the literature. © 2015, Pakistan Academy of Sciences.eninfo:eu-repo/semantics/closedAccessExistence Of Periodic SolutionFirst OrderFixed PointNeutral Differential EquationOn the Existence of Periodic Solutions To Non-Linear Neutral Differential Equations of First Order With Multiple DelaysArticle