1. Bennicelli R, Banach A, Szajnocha K, Ostrowski J (2004) The ability of Azolla caroliniana to remove heavy metals (Hg(II), Cr(III), Cr(VI)) from municipal wastewater. Chemosphere 55:141–146
2. Burkhead JL, Reynolds KA, Abdel-Ghany SE, Cohu CM, Pilon M (2009) Copper homeostasis. New Phytol 182:799–816
3. Byrne MJ, Hill MP, Robertson M, King A, Jadhav A, Katembo N, Wilson J, Brudvig R, Fisher J (2010) Integrated management of water hyacinth in South Africa: development of an integrated management plan for water hyacinth control, combining biological control, herbicidal control and nutrient control, tailored to the climatic regions of South Africa. Report to the Water Research Commission, Pretoria, South Africa.
4. Center TD, Spencer NR (1981) The phenology and growth of water hyacinth (Eichhornia crassipes (Mart.) Solms) in a eutrophic North-Central Florida lake. Aquat Bot 10:1–32
5. Chaney RL (1989) Toxic element accumulation in soils and crops: protecting soil fertility and agricultural food-chains. In: Bar-Yosef B, Barrow NJ, Goldshmid J (eds) Inorganic contaminants in the Vadose Zone. Springer, Berlin