Electronic Journal of Differential Equations,
Vol. 2006(2006), No. 117, pp. 1-11.

Title: Existence and uniqueness of periodic solutions
       for first-order neutral functional differential equations
       with two deviating arguments

Authors: Jinsong Xiao (Hunan City Univ., China)
         Bingwen Liu  (Jiaxing Univ., China)
	 
Abstract: 
 In this paper, we use the coincidence degree  theory to establish
 the existence and uniqueness of  T-periodic solutions  for
 the first-order neutral functional differential equation, with two
 deviating arguments,
$$
 (x(t)+Bx(t-\delta))'= g_{1}(t,x(t-\tau_{1}(t)))
                      +g_{2}(t,x(t-\tau_{2}(t))) +p(t).
$$ 

Submitted  March 16, 2006. Published September 26, 2006.
Math Subject Classifications: 34C25, 34D40.
Key Words: First order; neutral; functional differential equations;
        deviating argument; periodic solutions; coincidence degree.