Robert L. Nichols, The Etiology of Visceral Larva Migrans: II. Comparative Larval Morphology of Ascaris lumbricoides, Necator americanus, Strongyloides stercoralis and Ancylostoma caninum, The Journal of Parasitology, Vol. 42, No. 4, Section 1 (Aug., 1956), pp. 363-399
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Robert L. Nichols (1956) studied this question.
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