Frank O. Perkins, Sporulation in the Trematode Hyperparasite Urosporidium crescens De Turk, 1940 (Haplosporida: Haplosporidiidae): An Electron Microscope Study, The Journal of Parasitology, Vol. 57, No. 1 (Feb., 1971), pp. 9-23
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Frank O. Perkins (1971) studied this question.
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