Ismail, M.M.; Premaratne, U.N.; Abeyewickreme, W.; Jayasinghe, K.S.A.; de Silva, W.A.S.; Atukorala, S.; de Abrew, K.; Dissanaike, A.S.(Malaysian Society of Parasitology and Tropical Medicine, 1991)
Gunawardene, Y.I.N.S.; Wijesundera, W.S.; Karunanayake, E.H.; Chandrasekharan, N.V.; Jayasekara, N.; Siridewa, K.(SEAMEO Regional Tropical Medicine and Public Health Project, 1999)