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Nuñes-Ruivo, L. (1957). Contribution a l'étude des variations morphologiques de Clavella adunca (H. Strom), copépode parasite de Gadus callarias L., considérations sur quelques Clavella parasites des Gadidae. Revista da Faculdade de Ciências da Universidade de Lisboa (2c)5(2):229-256, figs. 1-7.