TY JOUR TI ENSURING THE WORK OF THE FIRE FIGHTING UNITS FOR EXTINGUISHING FIRES IN METRO BY MEANS OF THERMAL IMAGING SYSTEMS KW metro KW underground structures KW gas and smoke protection service KW fire hazards KW thermal imager JO Problems of risk management in the technosphere AU Terekhin, S.N. AU Nikolaev, D.V. AU Yusherov, K.S. PY 2018 IS 2018 PB Saint-Petersburg University of State Fire Service of Emercom of Russia