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