Kryvi, Harald 1971. The structure of the longitudinal muscles of Sabella penicillum (Annelida, Polychaeta), with a note on the contraction properties. Norwegian Journal of Zoology 19(2): 149-167.
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Kryvi, H.
1971
The structure of the longitudinal muscles of Sabella penicillum (Annelida, Polychaeta), with a note on the contraction properties