1. Alva AK, Graham JH, Tucker DPH (1993) Role of calcium in amelioration of copper phytotoxicity for citrus. Soil Sci 155(3):211–218
2. Anderson RV (1977) Concentration of cadmium, copper, lead, and zinc in six species of fresh water clams. Bull Environ Contam Toxicol 18(4):492–496
3. Anderson RV, Vinikour WS, Brower JE (1978) The distribution of cadmium, copper, lead and zinc in the biota of two freshwater sites with different trace metal inputs. Holarct Ecol 1(4):377–384
4. Bechtel Jacobs Company (1998) Biota sediment accumulation factors for invertebrates: review and recommendations for the Oak Ridge reservation. BJC/OR-112. Prepared by Bechtel Jacobs Company LLC for U.S. Department of Energy, Office of Environmental Management, Oak Ridge National Laboratory, Oak Ridge, TN
5. Darby PC, Valentine-Darby PL, Bennetts RE, Croop JD, Percival HF, Kitchens WM (1997) Ecological studies of apple snails. Special publication SJ98–SP6. Florida Cooperative Wildlife Research Unit, Gainesville, FL