Lu, Shi Ping, Existence of homoclinic solutions for a class of neutral functional differential equations, Acta mathematica Sinica. English series (Print) , 28(6), 2012, pp. 1261-1274
By means of Mawhin.s continuation theorem and some analysis methods, the existence of 2kT-periodic solutions is studied for a class of neutral functional differential equations, and then a homoclinic solution is obtained as a limit of a certain subsequence of the above periodic solutions set