Mudalige, U.K. jayasinghe; Ikram, S.M.M; Udugama, J.M.M; Edirisinghe, J.C; Herath, H.M.T.K(Faculty of Agriculture, University of Ruhuna, Sri Lanka, 2012-11-29)
Perera, H.S.C.; Ganewatta, G.K.H.; Rathnayake, C.V.; Buddhika, S.A.; Priyashantha, K.G.(Faculty of Management and Finance, University of Ruhuna, Matara, 2012)