4HOMER M W. Embedding economies of scale concepts for hub network design. Journal of Transport Geography [ J ]. 2001 (9) 255 - 265.
5O' KELLY M E. Hub location with flow economies of scale [J]. Transportation Research: Part B, 1998, 32 (8) : 605 -616.
6SKJOTF - LARSEN T, PAULSSON U, WANDEL S. Logistics in the Oresund Region after the Bridge [ J ]. European Journal of Operational Research, 2003 (144) : 247 - 256.
7BRYAN D L, O' KELLY M E. Hub - and - spoke networks in air transportation : an analytical review [ J]. Journal of Regional Science, 1999, 39 (2) : 275 -295.