1O'KellyM.E. Location of Integracting Hub Facilities[J]. Transportation Science, 1986, (20).
2Aykin T. Lagrangian Relaxation Based Approaches to Capacited Hub-and-spoke Network Design Problem[J].European Journal of Oper- ational Research, 1994, ( 79 ).
3Campbell J F. Integer Programming Formulations of Discrete Hub Loca- tion Problems[J]. European Journal of Operation Research,1994,(72).
4Skofin-Kapov D,Skofin-Kapov J,O' kelly M. Tight Linear Programming Relaxations of Uncapacitated P-hub Median Problem[J].European Jour- nal of Operational Research,1996, (94).
5Klincewicz J G. A Dual Algorithm for the Uncapacitated Hub Location Problem[J ]. Location Science,1996,4(3).
6Sohn J, Park S. Efficient Solution Procedure and Reduced Size Formula- tions for P-hub Location Problems[J].Europe Journal of Operational Re- search ,1998,(108).
7Liu,B, Liu, Y. K. Expected Value of Fuzzy Variable and Fuzzy Expect- ed Value Models[J].IEEE Transactions on Fuzzy Systems,2000,10(4).
