G. P. Butsan and M. Y. . Kozachenko, “Limiting theorem for the parametrical stochastic operator systems”, Ukr. Mat. Zhurn., vol. 40, no. 2, pp. 153–162, Feb. 1988, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/9111