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 Volume 10, Number 2, 2020, Pages 457-473 The existence of periodic solutions for three-order neutral differential equations Manna Huang,Chengjun Guo,Junming Liu Keywords:Periodic solutions, multiple deviating arguments, neutral differential equation. Abstract: In this paper, by using Kranoselskii fixed point point theorem and Mawhin''s continuation theorem, we establish two existence theorem on the periodic solutions for a class of three-order neutral differential equations. PDF      Download reader