BRATIICHUK, M. S.; CHECHELNITSKY , A. A.; USAR, I. Ya. M/M/1 retrial queueing model with variable service rate. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 72, n. 3, p. 355–365, 2020. DOI: 10.37863/umzh.v72i3.813. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/813. Acesso em: 27 apr. 2025.