pdf Arellano, S. R., Hall, M., Samaniego, P., Le Pennec, J.-L., Ruiz, A., Molina, I., & Yepes, H. (2008) Popular

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Degassing patterns of Tungurahua volcano (Ecuador) during the 1999–2006 eruptive period, inferred from remote spectroscopic measurements of SO2 emissions. Journal of Volcanology and Geothermal Research, 176(1), 151-162.

https://doi.org/10.1016/j.jvolgeores.2008.07.007