Martin J. Ulmer, Notes on the Morphology and Host-Parasite Specificity of Fibricola cratera (Barker and Noll, 1915) Dubois 1932 (Trematoda: Diplostomatidae), The Journal of Parasitology, Vol. 41, No. 5 (Oct., 1955), pp. 460-466
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Martin J. Ulmer (1955) studied this question.