2Hendricks K,Piccione M,Tan G F. Entry and exit in hub-spoke networks[J]. Rand Journal of Economics, 1997,28 (2) : 291- 303.
3Pels E, Nijkamp P, Rietveld P. A note on the optimality of airline networks[J]. Economics Letters, 2000,69:429-434.
4Kim D, et al. Multimodal express package delivery: a service network design application[J]. Transportation Science, 1999,33(4) : 391-407.
5Armacost A P, Barnhart C, Ware K A. Composite variable formulations for express shipment service network design [J]. Transportation Science, 2002, 36(1) :1-20.
6Grunert T, et al. Planning models for long-haul operations of postal and express shipment companies [J]. European Journal of Operational Research, 2000,122 (2) : 289 - 309.
7Buedenbender K, Grunert T, Sebastian H J. A hybrid tabu search/branch and bound algorithm for the direct flight network design problem[J]. Transportation Science, 2000,34 (4) : 364-380.
8Barnhart C, Schneur R R. Air network design for express freight service [J]. Operations Research, 1996,44 (6) : 852- 863.
9Smilowitz K, Atamturk A, Daganzo C F. Deferred item and vehicle routing within integrated networks [J]. Transportation Research E, 2003,39 (4): 305- 323.
10Kuby M J, Gray R G. The hub network design problem with stopovers and feeders: the case of federal express [J]. Transportation Research A, 1993,27(1) :1-12.
