TY JOUR TI CLUSTER APPROACH AS A TOOL FOR SUSTAINABLE TOURISM DEVELOPMENT STRATEGY KW boundary regions KW strategic management KW cluster approach KW boundary-region tourist cluster KW tourist product KW tourist resources JO Services in Russia and abroad AU Ginosyan, K.. AU Bolshakov, A.. AU Khavanova, N.. PY 2013 IS 7 PB Russian State University of Tourism and Service