Forero, Jhon, Carlos Zuluaga, and Jaime Mojica. “ALTERATION RELATED TO HYDROTHERMAL ACTIVITY OF THE NEVADO DEL RUIZ VOLCANO (NRV), COLOMBIA”. Boletín de Geología 33, no. 1 (February 17, 2012). Accessed July 22, 2024. https://revistas.uis.edu.co/index.php/revistaboletindegeologia/article/view/2472.