4Dantzig G B,Ramser J H.Optimum routing of gasoline delivery trucks[J].World Petroleum Congress,1959,(5):19-19.
5Balinski M L,Quandt R E.On an integer program for a delivery problem[J].Operations Research,1962,(12):300-304.
6Clarke G,Wrigth J.Scheduling of vehicles form a central depot to a number of delivery points[J].Operation Research,1964,(12):568-581.
7Rao M R,Zionts S.Allocation of transportation.units to alternative trips-A colurnn generation scheme with out-of-kilter subproblems[J].Operations Research,1968,(12):52-63.