1. Forno, I. W. & Harley, K. L. S. Aquat. Bot. 6, 185–187 (1979).
2. Varshney, C. K. & Rzoska, J. (eds) Aquatic Weeds in South East Asia (Junk, The Hague, 1976).
3. Mitchell, D. S., Petr, T. & Viner, A. B. Envir. Conserv. 7, 115–122 (1980).
4. Thomas, K. J. Envir. Conserv. 6, 63–69 (1979).
5. Bennett, F. D. Proc. Summer Inst. biol. Control, University of Mississippi, 224–237 (Univ. Mississippi Press, 1974); Biological Control for Water Quality Enhancement Workshop, University of Florida, Gainesville, 28–35 (US Environmental Protection Agency, (1975).