The Origins of Afroasiatic

@article{Ehret2004TheOO,
  title={The Origins of Afroasiatic},
  author={Christopher Ehret and Souleymane Keita and Paul Douglas Newman},
  journal={Science},
  year={2004},
  volume={306},
  pages={1680 - 1680}
}
In their Review “Farmers and their languages: the first expansions” (25 Apr. 2003, p. [597][1]), J. Diamond and P. Bellwood suggest that food production and the Afroasiatic language family were brought simultaneously from the Near East to Africa by demic diffusion, in other words, by a migration 
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