SOM, Bhupender Kumar; SETH, Sunny. M/M/c/N queuing systems with encouraged arrivals, reneging, retention and feedback customers. Yugoslav Journal of Operations Research, [S. l.], v. 28, n. 3, p. 333–344, 2018. DOI: 10.2298/YJOR170620006S. Disponível em: https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/543. Acesso em: 30 oct. 2025.