KAILASH C. MADAN. On optional deterministic server vacations in a batch arrival queueing system with a single server providing first essential service followed by one of the two types of additional optional service. Malaya Journal of Matematik, India, v. 4, n. 01, p. 25–36, 2016. DOI: 10.26637/mjm401/004. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/509. Acesso em: 16 jul. 2024.