| author | date | title | journal / publication | Bedini C, Papi F | 1970 | Peculiar patterns of microtubular organisation in spermatozoa of lower Turbellaria. In: Comparative Spermatology. (ed. B Baccetti):363-368. [Accad Naz Lincei 137:363-368.] | Academic Press, New York. |
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