pdf Monzier, M., Robin, C., Samaniego, P., Hall, M. L., Cotten, J., Mothes, P., & Arnaud, N. (1999) Popular

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Sangay volcano, Ecuador: structural development, present activity and petrology. Journal of Volcanology and Geothermal Research, 90(1–2), 49-79.

https://doi.org/10.1016/S0377-0273(99)00021-9