MOSKAL'TSOVA, N. V.; SHURENKOV, V. M. On asymptotics of the potential of a countable ergodic Markov chain. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 45, n. 2, p. 265–269, 1993. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5808. Acesso em: 5 dec. 2025.