Khachatryan, Kh. A., and S. M. Andriyan. “On the Solvability of a Class of Discrete Matrix Equations With a Cubic Nonlinearity”. Ukrains’kyi Matematychnyi Zhurnal 71, no. 12 (December 25, 2019): 1667-1683. Accessed April 20, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/186.