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A survey of rice-field weeds in Ratnapura and Kurunegala districts of Sri Lanka
(Natural Resources Energy and Science Authority of Sri Lanka:Colombo, 1989) Chandrasena, J.P.N.R.
Threshold density of Echinocloa crusgalli (L) beauv. in rice weed competition
(National Science Council :Colombo, 1986) Senanayake, N.; Ananda, w.W.S.R.M.R.; Pathirana, R.P.S.P.
Alkaloids of the Catharanthus species of Sri Lanka:some preliminary studies
(National Science Council:Colombo, 1976) Gunatilaka, A.A.L.; Siriwardene, H.M.U.; Sotheeswaran, S.; Balasubramaniam, S.