Ferreira, T., J. L. Gaspar, F. Viveiros, M. Marcos, C. Faria, and F. Sousa. “Monitoring of Fumarole Discharge and CO2 Soil Degassing in the Azores: Contribution to Volcanic Surveillance and Public Health Risk Assessment”. Annals of Geophysics 48, no. 4-5 (December 25, 2005). Accessed August 15, 2022. https://www.annalsofgeophysics.eu/index.php/annals/article/view/3234.