MALIK, V. F.; SAMOILENKO, I. V. Convergence of a semi-Markov process and an accompanying. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 5, p. 674–681, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2897. Acesso em: 6 dec. 2025.