The periodic solution for a kind odd order delay differential equation

@article{Cheng2013ThePS,
  title={The periodic solution for a kind odd order delay differential equation},
  author={Lifang Cheng},
  journal={Wuhan University Journal of Natural Sciences},
  year={2013},
  volume={18},
  pages={93-96}
}
In this paper, we use the coincidence degree theory to research the odd order delay differential equation a(t)x (2n+1)(t) + b(t)x(t) + g(t,x(t−τ(t))) = p(t), and we obtain the sufficient conditions for the existence of periodic solutions, which improves and generalizes some related results in the literatures.