TY JOUR TI MODELING OF A TWO-PHASE QUEUING SYSTEM WITH HETEROGENEOUS SERVERS AND CUSTOMER DISCARDING KW QUEUEING SYSTEMS KW HETEROGENEOUS CHANNELS KW PROBABILISTIC REJECTION KW SIMULATION MODELING KW TWO-PHASE SYSTEMS KW PERFORMANCE OPTIMIZATION KW PYTHON JO Herald of Technological University AU Gabdrahmanov, B.M. PY 2026 IS 29 PB Kazan National Research Technological University