Prykarpatsky, Y. A., Samoilenko, A. M., & Samoilenko, V. G. (2003). Structure of Binary Transformations of Darboux Type and Their Application to Soliton Theory. Ukrains’kyi Matematychnyi Zhurnal, 55(12), 1704-1719. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/4032