Existence and uniqueness of periodic solutions for a kind of Duffing equation with two deviating arguments

In this paper, we use the coincidence degree theory to establish new results on the existence and uniqueness of T-periodic solutions for a kind of Duffing equation with two deviating arguments of the form x″+Cx′(t)+g1(t,x(t−τ1(t)))+g2(t,x(t−τ2(t)))=p(t).