E. M. Elsayed, and Hanan S. Gafel. “On Some Systems of Three Nonlinear Difference Equations”. Journal of Computational Analysis and Applications (JoCAAA) 29, no. 1 (January 22, 2021): 86–108. Accessed December 19, 2024. https://eudoxuspress.com/index.php/pub/article/view/131.