http://www.academia.edu/1999030/The_surprisingly_late_adoption_of_slotted_perforation_tools_and_what_this_suggests_about_the_Neolithic_outlook
http://collections.museums-sheffield.org.uk/view/objects/asitem/342/4/collections-asc?t:state:flow=d4ebf051-3d3a-428a-9a11-4d0dadf199b9
http://www.biab.ac.uk/contents/28467
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