Article Information
vol. 317 no. 5837 482-487
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History:
- Received for publication May 2, 2007
- Accepted for publication July 5, 2007
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Copyright & Usage:
American Association for the Advancement of Science
Author Information
- 1 Center for Complex Network Research and Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA.
- 2 Center for International Development, Kennedy School of Government, Harvard University, Cambridge, MA 02139, USA.
- ↵† To whom correspondence should be addressed. E-mail: chidalgo{at}nd.edu
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↵* These authors contributed equally to this work.
