TY JOUR TI Approach to the solution of the problem of effective management of the tanker fleet KW blockchain KW key performance indicators KW operational expenditure KW voyage expenditure KW management of the fleet KW optimization KW budgeted expenses KW management system JO Operation of Maritime Transport AU Ardelyanov, N.. PY 2019 IS PB Budget Educational Institution of Higher Education “Admiral Ushakov State Maritime University”