(en) Adedeji B. Badiru et LeeAnn Racz, Handbook of Measurements : Benchmarks for Systems Accuracy and Precision, CRC Press, , 706 p. (ISBN978-1-4822-2523-5, lire en ligne), p. 12.
doi.org
dx.doi.org
(en) Francesco d'Errico, L. Backwell, P. Villaet al., « Early evidence of San material culture represented by organic artifacts from Border Cave, South Africa », Proceedings of the National Academy of Sciences, vol. 109, no 33, , p. 13214–13219 (PMID22847420, PMCID3421171, DOI10.1073/pnas.1204213109, Bibcode2012PNAS..10913214D).
harvard.edu
ui.adsabs.harvard.edu
(en) Francesco d'Errico, L. Backwell, P. Villaet al., « Early evidence of San material culture represented by organic artifacts from Border Cave, South Africa », Proceedings of the National Academy of Sciences, vol. 109, no 33, , p. 13214–13219 (PMID22847420, PMCID3421171, DOI10.1073/pnas.1204213109, Bibcode2012PNAS..10913214D).
nih.gov
ncbi.nlm.nih.gov
(en) Francesco d'Errico, L. Backwell, P. Villaet al., « Early evidence of San material culture represented by organic artifacts from Border Cave, South Africa », Proceedings of the National Academy of Sciences, vol. 109, no 33, , p. 13214–13219 (PMID22847420, PMCID3421171, DOI10.1073/pnas.1204213109, Bibcode2012PNAS..10913214D).