Dzhalladova, I. A. “Stochastic Lyapunov Functions for a System of Nonlinear Difference Equations”. Ukrains’kyi Matematychnyi Zhurnal 54, no. 8 (August 25, 2002): 1126. Accessed May 9, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4151.