1. L'ultrastrutura dei muscoli delle oloturie;Baccetti;Atti Delia Accademia Dei Fisiocritici in Siena,1968
2. Fine structure of the axial gland of Sphaerechinus granularis;Bachmann;Cell and Tissue Research,1978
3. The fine structure of the axial complex in the brittlestars, Ophiothrix angulata and Ophiactis savignyi;Balser;American Zoologist,1990
4. Organization and ultrastructure of the axial complex of Davidaster rubiginosa and D. discoidea;Balser;American Zoologist,1989