TY JOUR TI NECESSITY OF PORTFOLIO MANAGEMENT OF PROJECTS IN CONSTRUCTION KW project KW portfolio management KW construction KW life cycle KW mechanism KW investments JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Parfenova, E.N. AU Avilova, Z.N. PY 2018 IS 3 PB Belgorod State Technological University named after V.G. Shukhov