Existence and uniqueness of periodic solutions for a kind of second order neutral functional differential equations

In this paper, we use the coincidence degree theory to establish new results on the existence and uniqueness of TT-periodic solutions for the second order neutral functional differential equation of the form(x(t)+Bx(t-δ))″+Cx′(t)+g(x(t-τ(t)))=p(t).(x(t)+Bx(t-δ))″+Cx′(t)+g(x(t-τ(t)))=p(t).