Geochemical characterisation of Otumba obsidian sub-sources (Central Mexico) by inductively coupled plasma mass spectrometry and density-based spatial clustering of applications with noise statistical analysis. Open J Archaeometry [Internet]. 2013 Dec. 31 [cited 2026 Jun. 27];1(1):e18. Available from: https://journals.pagepress.net/arc/article/view/arc.2013.e18