Perera, E.H.L.; Viswakula, S.; Gunawardene, Y.I.N.S.; Subasinghe, U.; Hapugoda, M.D.(International Postgraduate Research Conference 2019, Faculty of Graduate Studies, University of Kelaniya, Sri Lanka, 2019)
Withanage, G.P.; Hapuarachchi, H.C.; Gunawardene, Y.I.N.S.; Hapugoda, M.D.(19th Conference on Postgraduate Research, International Postgraduate Research Conference 2018, Faculty of Graduate Studies,University of Kelaniya, Sri Lanka, 2018)