H. Y. Wang, “Periodic Solu-tions to Non-Autonomous Second-Order Systems,” Nonlinear Analysis: Theory, Methods & Applications, Vol. 71, No. 3-4, 2009, pp. 1271-1275.
has been cited by the following article:
TITLE: Periodic Solutions to Non-Autonomous Second-Order Dynamical Systems
AUTHORS: An-Min Mao, Miao-Miao Yang
KEYWORDS: Critical Point, Invariant Sets of Descending Flow, (PS) Condition
JOURNAL NAME: Advances in Pure Mathematics, Vol.1 No.3, June 3, 2011
ABSTRACT: We study the multiple existence of periodic solutions for a second-order non-autonomous dynamical systems (1). Using the method of invariant sets of descending flow and chain of rings theorem, we obtain the existence of seven -periodic solutions.