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4. Schistosomiasis mansoni in the city of Salvador, Bahia. Studies on the vector, host-parasites relationships and epidemiological aspects;Barretto;Bol. Fund. Gonçãlo Moniz, Bahia,1960
5. A comparative study of Schistosoma mansoni in Tropicorbis havanensis and Australorbis glabratus;Brooks;J. Parasitol.,1953