1. Andersen, J. M., 1976. An ignition method for the determination of total phosphorus in lake sediments. Wat. Res. 10: 329?331.
2. AOAC, 1984. Official Methods of Analysis. AOAC, Arlington, 1141 pp.
3. APHA, 1992. Standard Methods for the Examination of Water and Wastewater. APHA, Washington D.C., 1268 pp.
4. Ashton, P. J. & D. S. Mitchell, 1989. Aquatic plants: Patterns and modes of invasion, attributes of invading species and assessment of control programmes. In J. A. Drake et al. (eds), Biological Invasions: A Global Perspective. John Wiley & Sons, New York: 111?154.
5. Barko, J. W. & R. M. Smart, 1980. Mobilization of sediment phosphorus by submersed freshwater macrophytes. Freshwat. Biol. 10: 229?238.