TY JOUR TI ECONOMIC CLUSTER AND CLUSTER APPROACH IN THE ACTIVITIES OF CONSUMER COOPERATION KW consumer cooperation KW economic cluster KW socio-economic subsystem of the region KW development KW regional economy KW interregional cooperative ties JO Russian Journal of Management AU Mel'nikov, V.G. AU Mel'nikov, I.V. PY 2021 IS 9 PB Publishing Center RIOR