1. Activation par la lumiere des neurones pigmentis;Arvanitaki;Arch. Sci. Physiol.,1958
2. The Structure and function of the proboscis retractor muscle of the sipunculid Golfingia gouldii;Ernst,1970
3. The eyes and nervous system of Phascolosoma verrillii and other Sipunculids;Gerould;Trav. Stat. Zool. Wimereux,1939
4. The peripheral origin of nervous activity in the visual system;Hartline,1963