1. International Labour Office (ILO), 1999, Social and labour issues in small-scale mines, Report for the Tripartite Meeting on Social and Labour Issues in Small-scale Mines, Geneva 17-22 May, 1999.
2. Mercury in the Madeira river ecosystem, Rondônia, Brazil;Pfeiffer;Forest Ecology and Management,1991
3. Veiga MM. 1997. Introducing new technologies for abatement of global mercury pollution in Latin America. Ed. UNIDO/UBC/CETEM, Rio de Janeiro, 94 p.
4. Non-regulatory environmental measures;Moffet,1999
5. Priester M. 1995. Small-Scale Mining in Latin America. SMI Bull. n.8, p.1.