TY JOUR TI KW transportation problem KW linear programming problem KW minimum price criterion KW reference solution KW optimal solution KW selected on the basis of preset criterion KW basis variables KW potentials of rows and columns JO Transport automation research AU Degtyarev, V.. AU Khodakovsky, V.. PY 2017 IS 3 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"