Hewageegana, P.S.; Amarasekara, C.D.; Jayakody, J.R.P.; Punyasena, M.A.(Proceedings of the 16th Technical Session of the Institute of Physics - Sri Lanka, 2001)
Punyasena, M.A.; Amarasekara, C.D.; Jayakody, J.R.P.; Perera, P.A.A.(Annual Research Symposium, Faculty of Graduate Studies, University of Kelaniya, 2001)
Seneviratne, L.P.; de Silva, K.T.L.; Siripala, W.; Rosa, S.R.D.; Sonnadara, D.U.J.(Proceeding of the Technical Session of Institute of Physics, Sri Lanka, 2001)