QUEUEING SYSTEMS WITH DIFFERENT TYPES OF RENOVATION MECHANISM AND THRESHOLDS AS THE MATHEMATICAL MODELS OF ACTIVE QUEUE MANAGEMENT MECHANISM СтатьяViana Carvalho Cravid Hilquias, Zaryadov I.S., Milovanova T.A.Discrete and Continuous Models and Applied Computational Science. Том 28. 2020. С. 305-318