1. Andres, L. 2008. “Etude des contaminations métalliques sur les propriétés des sols autour de Lubumbashi [Master thesis]”. 77Gembloux, Belgium: Faculty of Agricultural Sciences of Gembloux.
2. Ayres, R U, Ayres, L W and Rade, I. 2002. “The life cycle of copper, its co-products and by-products. Mining minerals and sustainable development (MMSD) project N°24”. IIED and WBCSD, England, Reg No. 2188452. VAT Reg. No. GB 440 4948 50. Registered Charity No. 800066, January, 2002
3. High human exposure to cobalt and other metals in Katanga, a mining area of the Democratic Republic of Congo
4. Phytoremediation of Toxic Metals: Using Plants to Clean Up the Environment;Berti W,2000
5. Brooks, R R and Malaisse, F. 1990. “Metal-enriched sites in South Central Africa”. Edited by: Shaw, A J. 53–74. Boca Raton, FL: CRC Press. Heavy Metal Tolerance in Plants: Evolutionary Aspect