Robert Rausch, Studies on the Helminth Fauna of Alaska. XXI. Taxonomy, Morphological Variation, and Ecology of Diphyllobothrium ursi n. sp. Provis. on Kodiak Island, The Journal of Parasitology, Vol. 40, No. 5, Section 1 (Oct., 1954), pp. 540-563
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Robert Rausch (1954) studied this question.
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