pdf Hall, M. L., Robin, C., Beate, B., Mothes, P., & Monzier, M. (1999) Popular

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Tungurahua Volcano, Ecuador: structure, eruptive history and hazards. Journal of Volcanology and Geothermal Research, 91(1), 1-21.

https://doi.org/10.1016/S0377-0273(99)00047-5