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3. A controlled study of morbidity of schistosomiasis mansoni in St. Lucian children, based on quantitative egg excretion;Cook;American Journal of Tropical Medicine and Hygiene,1974
4. Schistosoma haematobium infection: immunity or concomitant immunity?;Jordan;Transactions of the Royal Society of Tropical Medicine and Hygiene,1974
5. A simple device for quantitative determination of Schistosoma mansoni eggs in faeces examined by the thick-smear technique;Katz;Revista do Instituto de Medicina Tropical do São Paulo,1972