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nih.gov
pubmed.ncbi.nlm.nih.gov
Hardy, Bruce; Marvin Kay, Anthony E. Marks, and Katherine Monigal (2001). “Stone tool function at the paleolithic sites of Starosele and Buran Kaya III, Crimea: Behavioral implications”. PNAS98 (19): 10972–10977. doi:10.1073/pnas.191384498. PMID11535837.