TY JOUR TI Research of methods and criteria for assessing the effectiveness of the management system at a communications services enterprise KW management efficiency KW telecommunications KW organizational management KW evaluation criteria KW performance indicators KW strategic management KW business processes KW competitiveness KW integrated assessment KW digital maturity JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Baryshnikov, P.V. PY 2025 IS 0 PB ITBO University