Attanayaka, D.P.S.T.G.Karunasekera, K.B.Rupatunge, K.W.Gamage A.K.Jayasekera, N.E.M.2014-07-082014-07-082003Journal of the National Institute of Plantation Management, 19(2):p.29-37https://dl-rri.nsf.gov.lk//handle/1/2318Article