Ponnamperuma, C.; Jayawardene, D.; Herath, S.T.; Madduma Bandara, C.M.; Mampitiyaarachchi, D.K.; Paranavithana, R.; Priyasekera, G.D.; Senanayake, K.S.; Rodrigo, C.N.M.; Vitanage, P.W.; Wijewansa, R.A.; Dahanayake, K.
(Institute of Fundamental Studies, Kandy, 1986)