Lu, Shi Ping et Ge, Wei Gao, On the Existence of Periodic Solutions for a Kind of Second Order Neutral Functional Differential Equation, Acta mathematica Sinica. English series (Print) , 21(2), 2004, pp. 381-392
By means of the continuation theorem of coincidence degree theory, some new results on the nonexistence, existence and unique existence of periodic solutions for a kind of second order neutral functional differential equation are obtained.