Pitigala, P.K.G.C.(In: Proceedings of the International Postgraduate Research Conference 2017 (IPRC – 2017), Faculty of Graduate Studies, University of Kelaniya, Sri Lanka., 2017)
Wehigaldeniya, W.G.D.S.; Weerasingha, G.S.M.; Jayawardhana, A.; Ramanayaka, A.R.N.D.(19th Conference on Postgraduate Research, International Postgraduate Research Conference 2018, Faculty of Graduate Studies,University of Kelaniya, Sri Lanka, 2018)