Vortsepneva, E.V., Zhadan, A.E. and Tzetlin, A.B. 2006. Spermiogenesis and sperm ultrastructure of Asetocalamyzas laonicola Tzetlin, 1985 (Polychaeta), an ectoparasite of the large spionid Scolelepis cf. matsugae Sikorsfi, 1994, from the White Sea. Scientia Marina. 70, S3 (Dec. 2006), 343–350. DOI:https://doi.org/10.3989/scimar.2006.70s3343.