Vasilyev, Sergey, AND 		Tzareva, Galina.
" USING SINGULAR PERTURBATED SYSTEMS OF DIFFERENCIAL EQUATIONS  OF  INFINITE ORDER FOR COUNTABLE MARKOV CHAINS ANALYSIS" <em>Современные информационные технологии и ИТ-образование</em> [Онлайн], Том 12 Номер 1 (25 November 2016)