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Nylund, A. 1981. The heart ultrastructure of Praunus flexuosus (Müller) and Mysis relicta (Lovén) (Crustacea, Mysidacea).-- Journal of Crustacean Biology: A Quarterly of the Crustacean Society for the Publication of Research on Any Aspect of the Biology of Crustacea 1 (4): 558-566.