Yezhov, I. I., & Kadankov, V. F. (2001). Main Probability Characteristics of the Queuing System $G^k|G|1$. Ukrains’kyi Matematychnyi Zhurnal, 53(10), 1343-1357. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/4354