Mahendra, R.A.R.; Attanayaka, D.P.S.T.G.; Chandrasekharan, N.V.; Ranathunga, R.A.C.A.; Withanage, S.P.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Mirando, J.S.; Fernando, T.H.P.S.; Nugawela, A.; Wijayaratne, C.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)