Nikitin, A. G. and Popovich, R. O. (2001) “Group Classification of Nonlinear Schrödinger Equations”, Ukrains’kyi Matematychnyi Zhurnal, 53(8), pp. 1053-1060. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4326 (Accessed: 14June2024).