N. V. Moskal'tsova and V. M. Shurenkov, “On potentials of ergodic Markov chains”, Ukr. Mat. Zhurn., vol. 46, no. 4, pp. 446–449, Apr. 1994, Accessed: Dec. 15, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5745