Chen, Y. “On Existence Theorems of Periodic Traveling Wave Solution to the Generalized Forced Kadomtsev-Petviashvili Equation”. Archives of Mechanics 48, no. 5 (January 1, 1996): 925–931. Accessed December 7, 2025. https://am.ippt.pan.pl/index.php/am/article/view/v48p925.