Invention as a combinatorial process: evidence from US patents. Youn, H., Strumsky, D., Bettencourt, L. M., & Lobo, J. Journal of the Royal Society interface, 12(106):20150272, The Royal Society, 2015.
bibtex   
@article{youn2015invention,
  title={Invention as a combinatorial process: evidence from US patents},
  author={Youn, Hyejin and Strumsky, Deborah and Bettencourt, Luis MA and Lobo, Jos{\'e}},
  journal={Journal of the Royal Society interface},
  volume={12},
  number={106},
  pages={20150272},
  year={2015},
  publisher={The Royal Society}
}

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