De Silva, L.H.L.C.; Herath, H.M.I.U.; Samaranayake, W.L.N.S.; Jayasinghe, S.I; Gunawardena, P.P.C.K.; Ariyawansha, A.P.H.M.; Wijeyarathne, K.K.; Azam, M.A.M.; Supunda, A.A.H.; Rathnayake, A.K.P.; Dissanayake, J.K.
(Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2014-01-22)