TY JOUR TI REDUNDANCY IN THE MANAGEMENT OF PRODUCTION SYSTEMS WITH UNPREDICTABLE RISKS KW production systems KW resource reservation KW unpredictable risks JO Problems of risk management in the technosphere AU Stebunov, S.V. AU Vlasova, T.V. PY 2015 IS 2015 PB Saint-Petersburg University of State Fire Service of Emercom of Russia