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S. A.  Nadler, Lindquist, R. L., and Near, T. J., ?Genetic structure of midwestern Ascaris suum populations: A comparison of isoenzyme and RAPD markers?, Journal of Parasitology, vol. 81, pp. 385?394, 1995.

T. J.  Near, Garey, J. R., and Nadler, S. A., ?Phylogenetic relationships of the Acanthocephala inferred from 18S ribosomal DNA sequences?, Molecular Phylogenetics and Evolution, vol. 10, pp. 287?298, 1998.