Paranagama, P.A.; Jayathilake, G.S.; Jayawardene, A.L.; Mubarak, A.M.; Senanayeke, U.M.; Wimalasena, S.(Proceedings of Sri Lanka Association of Advancement of Science, 1990)
Paranagama, P.A.; Jayathilake, G.S.; Jayawardene, A.L.; Mubarak, A.M.; Senanayeke, U.M.; Wimalasena, S.(Proceedings of Sri Lanka Association of Advancement of Science, 1990)