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Perhaps you are thinking of this paper:

   P. Holme and G. Ghoshal, Dynamics of networking agents competing for high
   centrality and low degree, Phys. Rev. Lett. 96, 098701 (2006).

Also available here: http://arxiv.org/abs/q-bio/0512014

Mark



On 02/22/2011 09:13 AM, Brian Keegan wrote:
> ***** To join INSNA, visit http://www.insna.org ***** I am trying to
> recall a paper in which the authors had a model where agents competed to
> have high betweenness but low degree. In the limit, the model tended
> towards star structures with only a handful of brokers.

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