00519naa#a2200157#i#450# EN\\bibl\114179 20260213211833.5 3034-4689 20260131b2026####ek#y0engy0150####ca RU MODELING OF A TWO-PHASE QUEUING SYSTEM WITH HETEROGENEOUS SERVERS AND CUSTOMER DISCARDING Journal article Kazan Kazan National Research Technological University 2026 4 с. Journal article local Gabdrahmanov Bulat Maratovich vestniktu.ru