TY JOUR TI STOCHASTIC METHODS OF DECISION-MAKING FOR DECREAS PROBABILITY OF EMERGENCIES KW environment KW mathematic model KW stochastic model KW emergencies JO Problems of risk management in the technosphere AU Galishev, M.A. AU Motorygin, Y.D. PY 2013 IS 2013 PB Saint-Petersburg University of State Fire Service of Emercom of Russia