1. Bayer process available on line(http://redmud.org/home.html).
2. Mineralogy, Geochemistry and Origin of the Sedimentary Fe–Ni Ores of Lokris;Alevizos,1997
3. Toxicological Profile for Chromium;ATSDR (Agency for Toxic Substances, Disease Registry),2000
4. Efficient and complete exploitation of the bauxite residue (red mud) produced in the Bayer process;Balomenos,2011
5. The fate of chromium during tropical weathering: a laterite profile from central Madagascar;Berger;Geoderma,2014