S. SINGH; R. K. SRIVASTAVA. Markovian Queueing System with Bulk Arrival and Three Types of Essential and Optional Services. International Journal of Mathematics And its Applications, [S. l.], v. 8, n. 4, p. 103–112, 2020. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/125. Acesso em: 18 may. 2024.