4ZHOU Zhan 1, YU JianShe 1 & CHEN YuMing 21 School of Mathematics and Information Science, Guangzhou University, Guangzhou 510006, China,2 Department of Mathematics, Wilfrid Laurier University, Waterloo N2L 3C5, Canada.Periodic solutions of a 2nth-order nonlinear difference equation[J].Science China Mathematics,2010,53(1):41-50. 被引量:10