TY JOUR TI APPROACHES TO CONSTRUCTION OF SIMULATION MODELS RESPONDING TO EMERGENCY SITUATIONS ON THE GAS PIPE KW emergency KW gas pipeline KW simulation model JO NATURAL AND MAN-MADE RISKS (PHYSICO-MATHEMATICAL AND APPLIED ASPECTS) AU Budanov, D.S. PY 2015 IS 2015 PB Saint-Petersburg University of State Fire Service of Emercom of Russia