Senevirathna, M. A. T. M.; Ratnayake, R. M. C. S.(4th International Research Symposium on Pure and Applied Sciences, Faculty of Science, University of Kelaniya, Sri Lanka, 2019)
Dandeniya, D. A. M. N.; Ratnayake, R. M. C. S.; Kumari, S. A. S. M.(. 4th International Research Symposium on Pure and Applied Sciences, Faculty of Science, University of Kelaniya, Sri Lanka., 2019)
Siriwardhana, K. H. W.; Ratnayake, R. M. C. S.(Research Symposium on Pure and Applied Sciences, 2018 Faculty of Science, University of Kelaniya, Sri Lanka, 2018)