By using minimax methods in critical point theory, a new existence theorem of infinitely many periodic solutions is obtained for a class of second-order -Laplacian systems with impulsive effects. Our result generalizes many known works in the literature.
Wen-Zhen Gong. Qiongfen Zhang. X. H. Tang. "Existence of Subharmonic Solutions for a Class of Second-Order -Laplacian Systems with Impulsive Effects." J. Appl. Math. 2012 1 - 18, 2012. https://doi.org/10.1155/2012/434938