Gunawardene, Y.I.N.S.Dassanayake, R.S.2015-08-082015-08-082004Proceedings of the Sri Lanka Association for the Advancement of Science. 2004; 60 (Part I): 9http://repository.kln.ac.lk/handle/123456789/9162Sri Lanka Association for the Advancement of Science, 60th Annual Sessions Abstracts(009A), December 2004. ColomboenConference Abstract