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by Dean, Henry L.
by Van Rheede Van Oudtshoorn, Karen; Van Rooyen, Margaretha W.; Van Rooyen, M. W.
by Raghavan, V.
by Raven
by International Symposium on Aquatic Weeds; Caffrey, J. M.; Barrett, Philip R. F.; et al.
by William K. Purves
by Buchanan, Bob; Gruissem, Wilhelm; Jones, Russell
by Jain, S. Mohan; Minocha, Subhash C.
by Johri, B. M.; Srivastava, P. S.