A. HELLEN, R. K. M/M/2 Heterogeneous Server Queue with Variant Breakdown and with Discouraged Arrivals. Mathematical Statistician and Engineering Applications, [S. l.], v. 71, n. 4, p. 1447–1458, 2022. DOI: 10.17762/msea.v71i4.641. Disponível em: https://www.philstat.org/index.php/MSEA/article/view/641. Acesso em: 3 may. 2024.