TY JOUR TI ISSUES OF FORECASTING OF MATERIAL SUPPLY USING INDIRECT MATHEMATICAL MODELS KW mathematical models KW options of transportation of material means KW optimum solution of an indistinct transport task KW indistinct set KW indistinct number KW membership function JO Problems of risk management in the technosphere AU Chernykh, A.K. AU Kozlova, I.V. AU Vilkov, V.B. PY 2015 IS 2015 PB Saint-Petersburg University of State Fire Service of Emercom of Russia