Prykarpatsky, Ya. A., A. M. Samoilenko, and V. G. Samoilenko. “Structure of Binary Transformations of Darboux Type and Their Application to Soliton Theory”. Ukrains’kyi Matematychnyi Zhurnal 55, no. 12 (December 25, 2003): 1704-1719. Accessed May 18, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4032.