JAIN, H. C. A double-ended queuing system. Defence Science Journal, [S. l.], v. 12, n. 4, p. 327–332, 2014. DOI: 10.14429/dsj.12.6997. Disponível em: https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/6997. Acesso em: 16 jun. 2025.