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Kudo, A.M., Jackson, M.E. and Husler, J.W. 1985. Phase chemistry of recent andesite, dacite, and rhyodacite of volcan Pico de Orizaba, Mexican Volcanic Belt: evidence for xenolitic contamination. Geofisica Internacional. 24, 4 (Oct. 1985), 679–689. DOI:https://doi.org/10.22201/igeof.00167169p.1985.24.4.1151.