Lawrence S. Ritchie, Seymour Garson, Duane G. Erickson, Attempts to Induce Resistance against Schistosoma mansoni by Injecting Cercarial, Adult Worm, and Egg Homogenates in Sequence, The Journal of Parasitology, Vol. 48, No. 2, Section 1 (Apr., 1962), pp. 233-236
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Ritchie et al. (1962) studied this question.
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