Freda Glass Schreiber, Maxwell Schubert, Results of Exposure of the Snail Australorbis glabratus to Varying Numbers of Miracidia of Schistosoma mansoni, The Journal of Parasitology, Vol. 35, No. 6, Section 1 (Dec., 1949), pp. 590-592
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Schreiber et al. (1949) studied this question.