Birgebayev, A., and M. Muratbekov. “SMOOTHNESS OF SOLUTIONS (SEPARABILITY) OF THE NONLINEAR STATIONARY SCHR¨ODINGER EQUATION”. Journal of Mathematics, Mechanics and Computer Science 115, no. 3 (September 27, 2022): 25–35. Accessed July 3, 2024. https://bm.kaznu.kz/index.php/kaznu/article/view/1161.