@article{bettencourt2007growth,
  title={Growth, innovation, scaling, and the pace of life in cities},
  author={Bettencourt, Lu{\'\i}s MA and Lobo, Jos{\'e} and Helbing, Dirk and K{\"u}hnert, Christian and West, Geoffrey B},
  journal={Proceedings of the national academy of sciences},
  volume={104},
  number={17},
  pages={7301--7306},
  year={2007},
  publisher={National Academy of Sciences}
}

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