| Singer, Donald A., Berger, Vladimir I., Moring, Barry C. (2009) Sediment-Hosted Zinc-Lead Deposits of the World - Database and Grade and Tonnage Models. Open-File Report 2009-1252. US Geological Survey doi:10.3133/ofr20091252 Xu, G. (1997): Mineralium Deposita 32, 58-69. |