1. Los yacimientos minerales de Bolivia;Ahlfeld,1954
2. Los yacimientos minerales y de hidrocarburos de Bolivia;Ahlfeld,1964
3. Acid Mine Drainage (AMD): causes, treatment and case studies;Akcil;J. Clean. Prod.,2006
4. Sulphate Minerals Crystallography, Geochemistry, and Environmental Significance,2000
5. Seasonal variations of Zn/Cu ratios in acid mine water from Iron Mountain, California;Alpers,1994