TY JOUR TI EVALUATION OF THE EFFECTIVENESS OF THE IMPLEMENTATION OF QUALITY MANAGEMENT SYSTEMS IN THE OIL AND GAS INDUSTRY KW productivity KW effectiveness KW quality management system KW process approach KW principles of management KW economic efficiency JO Vestnik of Astrakhan State Technical University. Series: Economics AU Druzhinin, M.. AU Kozlova, A.. AU Chesnokova, S.. PY 2017 IS PB Astrakhan State Technical University