1. The Neves Corvo Mine;Murray,1990
2. Mineralogia e geoquimica do minério MH do projecto de separação de elementos menores economicamente estratégicos — estudos preliminares;Pinto;Somincor Internal Report,1992
3. Identification of the minerals hosting mercury and silver in the Neves-Corvo ores, Report on a Mineralogical Study;Bowles;Somincor Internal Report,1990
4. The ore minerals and their intergrowths;Ramdohr,1980
5. Somincor's project of minor elements;Franco;Somincor Internal Report,1991