Kethmi, G. A. P.; Premarathna, L. P. N. D.(4th International Research Symposium on Pure and Applied Sciences, Faculty of Science, University of Kelaniya, Sri Lanka, 2019)
Sumithrapala, D. M. S. S.; Mallawa Arachchi, D. K.(Research Symposium on Pure and Applied Sciences, 2018 Faculty of Science, University of Kelaniya, Sri Lanka, 2018)