Mitropolsky , Yu. A., A. K. Prikarpatsky, and V. Gr. Samoilenko. “Algebraic Scheme of Discrete Approximations of Linear and Nonlinear Dynamic Systems of Mathematical Physics”. Ukrains’kyi Matematychnyi Zhurnal 40, no. 4 (June 28, 1988): 453–458. Accessed December 6, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/9180.