1. Abdel-Basset R, Issa AA, Adam MS (1995) Chlorophyllase activity: effect of heavy metals and calcium. Photosynthetica 31:421–425
2. APHA (1998) Standard methods for the examination of water and wastewater. American Public Health Association, New York
3. Barko JW, Gunnison D, Carpenter SR (1991) Sediment interactions with submersed macrophyte growth and community dynamics. Aquat Bot 41:41–65
4. Bishop P, Eighmy T (1989) Aquatic wastewater treatment using Elodea nutallii. J Water Pollut Control Fed 61(5):641–648
5. Bonilla I (2008) Introducción a la nutrición mineral de las plantas. Los elementos minerales. In: Azcón-Bieto J, Talón M (eds) Fundamentos de Fisiología Vegetal. Mc Graw Hill-UBe, New York, pp 103–121