FAL, A. M. On recurrence time for some Markovian random walk . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 6, p. 824–830, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8635. Acesso em: 5 dec. 2025.