TY JOUR TI SELECTING A MODEL OF COOPERATION WITH CORPORATE BUYERS IN THE REGIONAL MARKET OF BUILDING MATERIALS KW partnership KW business interaction KW cooperation KW client portfolio JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Starikova, M.S. AU Rastopchina, Y.L. PY 2018 IS 3 PB Belgorod State Technological University named after V.G. Shukhov