TY JOUR TI STUDY OF BUILDING INORGANIC MATERIALS BASED ON GYPSUM BY IR SPECTROSCOPY KW fire site inspection KW fire investigation KW laboratory research methods KW expert KW infrared spectroscopy KW instrumental research JO Siberian Fire and Rescue Bulletin AU Dolgushina, L.V. AU Popova, A.I. PY 2022 IS 2022 PB FSBEE HE Siberian Fire and Rescue Academy EMERCOM of Russia