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03812679 Ivchenko, G.I. Kashtanov, V.A. Kovalenko, I.N. Theory of mass service. Textbook. (Teoriya massovogo obsluzhivaniya. Uchebnoe posobie). Moskva: "Vysshaya Shkola". 256 p. R. 0.70 (1982). 1982 RU undergraduate textbook semi-Markov models