1. Ultrastructure of cells from the adenomera of the digestive gland of Helix aspersa M;Almendros,1988
2. Free calcium ions in neurons of Helix aspersa measured with ion-selective micro-electrodes;Alvarez-Leefmans;J. Physiol. (London),1981
3. Die Mikromorphologie von Helix pomatia und einigen anderen Stylommatophoren;Baecker;Z. Ges. Anat. Abt. III,1932
4. The seasonal and daily patterns of locomotor activity in the snail Helix aspersa Müller, and their relation to environmental variables;Bailey,1975
5. Circannual and circadian rhythms in the snail Helix aspersa Müller and the photoperiodic control of annual activity and reproduction;Bailey;J. Comp. Physiol.,1981