徐建中,周宗福.一类四阶具有多个偏差变元p-Laplacian中立型微分方程周期解的存在性[J].重庆工商大学学报(自然科学版),2012,29(11):9-16
XU Jian-zhong, ZHOU Zong-fu. The Existence of Periodic Solutions for a Class of Fourth-order p-Laplacian Neutral Functional Differential Equation with Multiple Deviating Arguments[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2012,29(11):9-16