TY JOUR TI PERFORMANCE ANALYSIS OF THE MATHEMATICAL MODELS OF QUALITY INDICATORS IN THE SYSTEM EMERCOM OF RUSSIA KW difficult dynamic system KW subsystem KW crisis JO Problems of risk management in the technosphere AU Davidova, A.A. AU Vorona-Slivinskaya, L.G. PY 2013 IS 2013 PB Saint-Petersburg University of State Fire Service of Emercom of Russia