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2. Gnedenko, B.V., Kovalenko, I.N.: Introduction to Queuing Theory. KomKniga, MOSCOW (2007). (In Russian)
3. Koening, D., Shtoyan, D.: Methods of the Queuing Theory. Radio and Communications, Moscow (1981). (In Russian)
4. Falin, G.I., Templeton, J.G.C.: Retrial Queues. Chapman & Hall, London (1997)
5. Artalejo, J.R., Gomez-Corral, A.: Retrial Queueing Systems: A Computational Approach. Springer, Heidelberg (2008)