@article{bettencourt2004invention,
  title={Invention in the city: Increasing returns to scale in metropolitan patenting},
  author={Bettencourt, Luis MA and Lobo, Jos{\'e} and Strumsky, Deborah},
  journal={Los Alamos National Laboratory technical ReportLAUR-04-8798},
  year={2004},
  publisher={Citeseer}
}

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