pdf Samaniego, Pablo, Martin, H., Monzier, M., Robin, C., Fornari, M., Eissen, J.-P., & Cotten, J. (2005) Popular

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Temporal Evolution of Magmatism in the Northern Volcanic Zone of the Andes: The Geology and Petrology of Cayambe Volcanic Complex (Ecuador). Journal of Petrology, 46(11), 2225-2252.

https://doi.org/10.1093/petrology/egi053