1. The fine structure of the sea urchin spermatozoa as revealed by electron microscope;Afzelius;Z. Zellforsch.,1955
2. Fine structure of the spermatozoa of Tubularia larynx (Hydrozoa Coelenterata);Afzelius;J. Ultrastruct. Res.,1971
3. The spermatozoon of the nemertine Malacobdella grossa;Afzelius;J. Submicr. Cytol.,1971
4. Fine structure of brachiopod spermatozoa;Afzelius;J. Ultrastruct. Res.,1978
5. The spermatozoa of Priapulus caudatus Lamarck;Afzelius;J. Submicr. Cytol.,1978