@article{ortman2015settlement,
  title={Settlement scaling and increasing returns in an ancient society},
  author={Ortman, Scott G and Cabaniss, Andrew HF and Sturm, Jennie O and Bettencourt, Lu{\'\i}s MA},
  journal={Science advances},
  volume={1},
  number={1},
  pages={e1400066},
  year={2015},
  publisher={American Association for the Advancement of Science}
}

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