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Argote-Espino, D., Solé, J., López-García, P. and Sterpone, O. 2013. 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 Journal of Archaeometry. 1, 1 (Dec. 2013), e18. DOI:https://doi.org/10.4081/arc.2013.e18.