TY JOUR TI STUDY THE POSSIBILITY OF USING UNMANNED AERIAL VEHICLES IN EMERGENCIES KW multicopter KW unmanned aerial vehicle KW quadrocopter JO NATURAL AND MAN-MADE RISKS (PHYSICO-MATHEMATICAL AND APPLIED ASPECTS) AU Gvozdic, M.I. AU Saphonov, D.P. PY 2014 IS 2014 PB Saint-Petersburg University of State Fire Service of Emercom of Russia