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Authoritative: http://dx.doi.org/10.1073/pnas.95.23.13994   (Publisher's PDF... likely be available here.)

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Abstract

Linguistic evidence indicates that the Yeniseian family of languages, spoken in central Siberia, is most closely related to the Na-Dene family of languages spoken, for the most part, in northwestern North America. This hypothesis locates the source of one of the three migrations responsible for the peopling of the Americas.

@article{ruhlen98originNaDenePNAS,
  author={M. Ruhlen},
  title={The origin of the Na-Dene},
  journal={PNAS},
  year={1998},
  volume={95},
  number={23},
  pages={13994-13996},
  doi={10.1073/pnas.95.23.13994},
  url={http://www.isrl.uiuc.edu/~amag/langev/paper/ruhlen98originNaDenePNAS.html}
}