Bich, Nguyen Dang, and Nguyen Vo Thong. “Some Solvable Non-Linear Equations Related to Aerodynamic Instability Phenomena”. Vietnam Journal of Mechanics 16, no. 4 (December 31, 1994): 11–14. Accessed April 24, 2024. https://vjs.ac.vn/index.php/vjmech/article/view/10176.