1. Chouikki A (1980) Choix et mise au point de chaines alimentaires “eau douce” permettant de mettre en évidence le caractère bioaccumulatif d'un polluant. Thèse Docteur Sciences Pharmaceutiques Université Paris-Sud
2. Devi-Prasad PV and Devi-Prasad PS (1982) Effect of cadmium lead and nickel on three freshwater green algae. Water Air and Soil Pollut 3:263–268
3. Friberg L, Piscator M, Nordberg GF and Kjellström T (1976) Cadmium in the environment. Ed CRC Press Cleveland 248
4. Hillman WS (1961) The Lemnacea or duckweeds, a review of the descriptive and experimental litterature. The Bot Review 27:221–287
5. Hutchinson TC and Czyrska H (1975) Heavy metal toxicity and synergism to floating aquatic weeds. Verk Internat Verein Limnol 19: 2102–2111