Dharmarathna, K.P.D.U.; Jayasinghe-Mudalige, U.K.; Silva, K.D.R.R.; Chandrasekara, G.A.P.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2006)
Ranaweera, C.D.; Gunathilaka, H.A.W.S.; Widanapathirana, A.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Karunarathna, N.D.C.R.; Fernandopulle, M.N.D.; Herth, C.S.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)