SEENIVASAN, M.; RAMESH, R.; PATRICIA, F. A markovian queueing model with catastrophe, unreliable and backup server. International journal of health sciences, [S. l.], v. 6, n. S5, p. 9136–9150, 2022. DOI: 10.53730/ijhs.v6nS5.10690. Disponível em: https://sciencescholar.us/journal/index.php/ijhs/article/view/10690. Acesso em: 10 oct. 2025.