PelyukhG. P. “General Solution of Systems of Nonlinear Difference Equations With Continuous Argument”. Ukrains’kyi Matematychnyi Zhurnal 52, no. 7 (July 25, 2000): 936-953. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4493.