%0 Journal Article
%T Existence of multiple periodic solutions for a class of first-order neutral differential equations
%A Chengjun Guo
%A Donal O¡¯Regan
%A Ravi P. Agarwal
%J Applicable Analysis and Discrete Mathematics
%D 2011
%I University of Belgrade and Academic Mind
%R 10.2298/aadm100914028g
%K Infinite periodic solutions
%K First-order neutral differential equations
%K Generalized Poincar¡äe-Birkhoff fixed point theorem
%K Mawhin¡¯s continuation theorem
%K Krasnoselskii fixed point theorem.
%U http://pefmath.etf.rs/vol5num1/AADM-Vol5-No1-147-158.pdf