1. Bose, S.: An Introduction to Queueing Systems. Kluvar Academic/Plenum Publishers, New York (2008)
2. Cooper, R.: Introduction to Queueing Theory, 3rd edn. CEE Press, Washington, (1990)
3. Hadidi, N.: Busy periods of queues with state dependent arrival and service rates. J. Appl. Probab. 11, 842–848 (1974)
4. Janos, S.: Basic Queueing Theory. Globe Edit Publishers, Omniscriptum GMBH, Germany (2016)
5. Klimenok, V.I., Taramin, O.S.: A tandem queueing system with losses and blocking. Appl. Comput. Math. 6(2), 295–311 (2007)