A. James Haley, Biology of the Rat Nematode, Nippostrongylus brasiliensis (Travassos, 1914). II. Preparasitic Stages and Development in the Laboratory Rat, The Journal of Parasitology, Vol. 48, No. 1 (Feb., 1962), pp. 13-23
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A. James Haley (1962) studied this question.
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