Madhurangi, H.M.T.; Dissanayake, N. P.; Kodikara, K.A.S.; Perera, A.J.D.; Jayatissa, L.P.(Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2016-01-28)
Madarasinghe, S. K.; Kodikara, K. A. S.; Dissanayake, N. P.; Satyanarayana, B.; Jayatissa, L. P.(Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2016-01-28)