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2. Anisimov, V.V.: Switching Processes in Queueing Models. ISTE Ltd. (2008)
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4. Billingsley, P.: Convergence of Probability Measures. Willey, Hoboken (1999)
5. Gihman, I.I., Skorohod, A.V.: Theory of Stochastic Processes, vol. 1. Nauka, Moscow (1971). (in Russian)