Y. A. Mitropolskiy, “Approximate solution of the Fokker-Planck-Kolmogorov equation”, Ukr. Mat. Zhurn., vol. 47, no. 3, pp. 351–361, Mar. 1995, Accessed: Apr. 23, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5424