Information technologies and mathematical modelling queueing theory and applications : 17th International Conference, ITMM 2018, Named After A.F. Terpugov, and 12th Workshop on Retrial Queues and Related Topics, WRQ 2018, Tomsk, Russia, September 10-15, 2018 : selected papers - Dudin, Aleksandr; Nazarov, Anatolij Andreevič; Moiseev, Aleksandr (Springer, 2018)