2[3]Williams R J. On the Queueing Networks in Heavy Traffic, Stochastic Networks: Theory and Applications[M] Clarendon Press, 1996. 被引量:1
3[4]Cheng Changlin The Freight Routing Problem of Time-Definite Freight Delivery Common Carriers[J], Transportation Research Part B, 2001.7:525-547. 被引量:1