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Frank W. Douvres, Francis G. Tromba, George M. Malakatis, Morphogenesis and Migration of Ascaris suum Larvae Developing to Fourth Stage in Swine, The Journal of Parasitology, Vol. 55, No. 4 (Aug., 1969), pp. 689-712
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Douvres et al. (1969) studied this question.
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