TY JOUR TI Integrated approach to assessing the efficiency of human capital investment in the oil and gas industry KW human capital KW oil and gas industry KW personnel costs KW operational efficiency KW assessment model KW profitability KW financial indicators KW social indicators KW motivation methods KW staff turnover KW strategic management JO Economic and Social Research AU Andreeva, A.A. AU Markeeva, V.A. PY 2025 IS 12 PB National Research University of Electronic Technology