Coppa, A. et al. 2006. «Early Neolithic tradition of dentistry: Flint tips were surprisingly effective for drilling tooth enamel in a prehistoric population.» Nature. Volume 440. 6 April 2006.
https://www.nature.com/articles/440755aАрхивная копия от 28 сентября 2011 на Wayback Machine
Coppa, A. et al. 2006. «Early Neolithic tradition of dentistry: Flint tips were surprisingly effective for drilling tooth enamel in a prehistoric population.» Nature. Volume 440. 6 April 2006.
https://www.nature.com/articles/440755aАрхивная копия от 28 сентября 2011 на Wayback Machine