Panajew, Paweł, and Andrzej Gałaś. “Stratovolcanoes on the Chilean-Bolivian Border As Geoatraction”. Geotourism/Geoturystyka, no. 3-4(62-63) (January 31, 2023): 47–64. Accessed May 3, 2024. https://journals.agh.edu.pl/geotour/article/view/5257.