Kumari, J.M.K.W.; Dissanayake, M.A.K.L.; Senadeera, G.K.R.; Thotawatthage, C.A.; Weerasinghe, A.M.J.S.(Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2017-01-26)
Gunathilaka, M.D.K.S.; Jayaweera, J.M.W.L.; Sandaruwan, A.M.D.M.; Rajakaruna, G.M.; Karunananda, A.S.(Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2014-01-22)