Premaratna, R.; Gunatilake, A.K.E.; de Silva, N.R.; Tilakaratne, Y.; Fonseka, M.M.D.; de Silva, H.J.(SEAMEO Regional Tropical Medicine and Public Health Project, 2001)
Hapuarachchi, H.A.C.; Dayanath, M.Y.D.; Abeysundara, S.; Bandara, K.B.A.T.; Abeyewickreme, W.; de Silva, N.R.(Sri Lanka Association for the Advancement of Science, 2005)
Hapuarachchi, H.A.C.; Dayanath, M.Y.D.; Abeysundara, S.; Bandara, K.B.A.T.; Abeyewickreme, W.; de Silva, N.R.(Sri Lanka Association for the Advancement of Science, 2004)