Wei Yan, Quan Liu, ChongMing Zhu, Yang Zhao, and Yuxiang Shi. “Semi-Inverse Method to the Klein-Gordon Equation With Quadratic Nonlinearity”. Applied Computational Electromagnetics Society Journal (ACES) 33, no. 08 (July 22, 2021): 842–846. Accessed August 24, 2024. https://journals.riverpublishers.com/index.php/ACES/article/view/9029.