G. Dikmans, John S. Andrews, A Comparative Morphological Study of the Infective Larvae of the Common Nematodes Parasitic in the Alimentary Tract of Sheep, Transactions of the American Microscopical Society, Vol. 52, No. 1 (Jan., 1933), pp. 1-25
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Dikmans et al. (1933) studied this question.
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