Abeysekera, A.M.Jayaweera, J.P.N.Thananchayan, M.2016-06-202016-06-201993Proceedings of the 49th Annual Sessions of the Sri Lanka Association for the Advancement of Science:p.241-242https://dl.nsf.gov.lk/handle/1/23299ChemistryARG/89/C/001FR 0419