Clara K. Fenger, David E. Granstrom, John L. Langemeier, Alvin Gajadhar, Gus Cothran, Robert R. Tramontin, Shelby Stamper, J. P. Dubey, Phylogenetic Relationship of Sarcocystis neurona to Other Members of the Family Sarcocystidae Based on Small Subunit Ribosomal RNA Gene Sequence, The Journal of Parasitology, Vol. 80, No. 6 (Dec., 1994), pp. 966-975
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Fenger et al. (1994) studied this question.