Research published today, Friday, 3 December 2010, in New Journal of Physics, details a physical model, which can potentially explain how the spreading of Neolithic farmers was slowed down by the population density of hunter-gatherers.
http://www.physorg.com/news/2010-12-farmers-hunter-gatherers-ancestors-space.html
Kompletter Text:
http://iopscience.iop.org/1367-2630/12/12/123002/fulltext