Victor Sprague, P. E. Orr, Jr., Nematopsis ostrearum and N. prytherchi (Eugregarinina: Porosporidae) with Special Reference to the Host-Parasite Relations, The Journal of Parasitology, Vol. 41, No. 1 (Feb., 1955), pp. 89-104
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Sprague et al. (1955) studied this question.
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