Wanninayakea, P. C. U.; Yapa, P. N.; Malaviarachchi, M. A. P. W. K.; Hettiarachchi, R. P.(4th International Research Symposium on Pure and Applied Sciences, Faculty of Science, University of Kelaniya, Sri Lanka, 2019)
Herath, H. M. B. M. M. D.; Yapa, P. N.; Sandaruwan, M. K. K. D.(4th International Research Symposium on Pure and Applied Sciences, Faculty of Science, University of Kelaniya, Sri Lanka, 2019)
Lakmali, J. P. D.; Yapa, P. N.; Sandaruwan, M. K. K. D(4th International Research Symposium on Pure and Applied Sciences, Faculty of Science, University of Kelaniya, Sri Lanka, 2019)
Tharaka, H. M. D.; Yapa, P. N.; Bamunuarachchige, C. T.(4th International Research Symposium on Pure and Applied Sciences, Faculty of Science, University of Kelaniya, Sri Lanka, 2019)