TY JOUR TI THE TEST OF GYPSUM BOARD FRAME BY MAGNETIC METHOD IN THE PERFORMANCE OF FIRE-TECHNICAL EXAMINATION KW gypsum board KW metal frame KW metal profile KW magnetic method KW coercive force JO Vestnik of the East Siberian institute of the Ministry of internal affairs of the Russian Federation AU Malysheva, S.F. AU Plotnikova, G.V. PY 2017 IS PB East Siberian institute of the Ministry of Internal Affairs of the Russian Federation