1. Cobalt supply and demand 2008;Cobalt Development Institute,2009
2. Famous mineral localities: Bou Azzer, Morocco;Favreau;The Mineralogical Record,2007
3. Ore-forming processes related to lateritic weathering;Freyssinet,2005
4. History of cobalt;Habashi,2009
5. Managem's global expansion begins in west Africa;Managem;Mining Review Africa,2005