1) Codex alimentarius commission. Report of the 36th Session of the Codex Committee on Food Additives and Contaminants. Rotterdam, The Netherlands, 22-26 March 2004. (2004)
2) BAKER A. J. M. Metal hyperaccumulator plants : a review of the ecology and physiology of biological resources for phytoremediation of metal-polluted soils. Land Treatment of Hazardous Waters. Moyes Data Corp.. (2000)
3) HASEGAWA I. Phytoremediation : a novel strategy for removing toxic heavy metals from contaminated soils using plants. Farming Japan. (2002) vol.36, p.10-15.