MokhonkoA. A. “On Some Solvable Classes of Nonlinear Nonisospectral Difference Equations”. Ukrains’kyi Matematychnyi Zhurnal 57, no. 3 (March 25, 2005): 356–365. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3603.