Bouchentouf, Amina Angelika, Mohamed Boualem, Mouloud Cherfaoui, and Latifa Medjahri. 2021. “Variant Vacation Queueing System With Bernoulli Feedback, Balking and server’s States-Dependent Reneging”. Yugoslav Journal of Operations Research 31 (4):557-75. https://doi.org/10.2298/YJOR200418003B.