TY JOUR TI Methodological principle of the optimal option chose of transportation in tramp shipping KW system KW tramp tonnage KW optimal plan KW solution KW ballast mn JO Operation of Maritime Transport AU Eglit, Y.Y. AU Kovtun, A.. AU Eglite, K.Y. AU Telyatnikov, A.. PY 2021 IS PB Budget Educational Institution of Higher Education “Admiral Ushakov State Maritime University”