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S. Oonk; C.P. Slomp; D.J. Huisman; S.P. Vriend. (2009). Effects of site lithology on geochemical signatures of human occupation in archaeological house plans in the Netherlands. , 36(6), 0–1228. doi:10.1016/j.jas.2009.01.010 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research