Gałaś, A., P. Panajew, and P. Cuber. “Stratovolcanoes in the Western Cordillera – Polish Scientific Expedition to Peru 2003–2012 Reconnaissance Research”. Geotourism/Geoturystyka, no. 37, Nov. 2015, p. 61, doi:10.7494/geotour.2014.37.61.