Gunawardhana, Prishanta; Katugampola, Mangala(Proceedings of the Annual Research Symposium 2005-Faculty of Graduate Studies, University of Kelaniya, 2005)
Weerasinghe, W M D; Silva, E I L; Dias, R.K.S.(Proceedings of the Annual Research Symposium 2005-Faculty of Graduate Studies, University of Kelaniya, 2005)