TY JOUR TI TOURISM INDUSTRY OBJECTS CERTIFICATION UNDER THE "HALAL FRIENDLY" PROGRAM: THE MODERN ASPECT KW halal tourism KW Halal KW Halal Friendly KW Voluntary Certification KW tourist flow KW objects of the tourist industry KW hotel enterprises JO Services in Russia and abroad AU Duhovnaya, L.L. PY 2017 IS 11 PB Russian State University of Tourism and Service