TY JOUR TI MATHEMATICAL APPARATUS FOR OPTIMIZING THE FUNCTIONING OF THE CENTERS FOR VERIFICATION OF MEASURING INSTRUMENTS OF EMERCOM OF RUSSIA IN CASE OF NON-STATIONARY FLOWS OF APPLICATIONS KW measuring instruments KW verification KW rescue operations KW monitoring KW queuing system KW optimization KW maintenance intensity KW system stability JO Scientific and analytical journal «Vestnik Saint-Petersburg university of State fire service of EMERCOM of Russia» AU Garelina, S.A. AU Lyubkin, R.N. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia