Frederick C. Colley, Andrew C. Olson, Jr., Posthodiplostomum minimum (Trematoda: Diplostomidae) in Fishes of Lower Otay Reservoir, San Diego County, California, The Journal of Parasitology, Vol. 49, No. 1 (Feb., 1963), p. 148
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Colley et al. (1963) studied this question.
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