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3. Electron microscope observations on calcium cells in the hepatopancreas of the snail Helix pomatia 1;Abolins-Krogis;Arkiv. För. Zoologi.,1970
4. Ultrastructure of cells from the adenomera of the digestive gland of Helix aspersa. M;Almendros,1988
5. Detection of a somatostatin-14 peptide in the hepatopancreas of the snail Helix aspersa;Assaka;C. R. Seances Soc. Biol. Fil.,1987