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P. H. Rabinowitz, “Minimax Methods in Critical Point Theory with Applications to Differential Equations,” Expository Lectures from the CBMS Regional Conference, Series in Mathematics, American Mathematical Society, Vol. 65, 1986.

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.