Boiko, V. M., and V. I. Fushchich. “Galilei-Invariant Higher-Order Equations of Burgers and Korteweg-De Vries Types”. Ukrains’kyi Matematychnyi Zhurnal 48, no. 12 (December 25, 1996): 1589–1601. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5182.