(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1997) Alexander, P.A.B.D.; Abeygunawardena, H.; Perera, B.M.A.O.; Abeygunawardena, I.S.
(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1998) Alexander,P.A.B.D.; Abeygunawardena, H.; Perera, B.M.A.O.; Abeygunawardena, I.S.
