1. Chabicovsky M, Niederst�tter H, Thaler R, H�dl E, Parson W, Ross-manith V, Dallinger R. 2003. Localization and quantification of Cd-and Cu-specific metallothionein isoform mRNA in cells and organs of the terrestrial gastropod Helix pomatia. Toxicol Appl Pharm 190, 25?36.
2. Dimitriadis VK. 2001 Structure and function of the digestive sys-tem in Stylommatophora. In: Barker GM, ed. The Biology of Terrestrial Molluscs. Wallingford: CABI Publishing: 237?257.
3. Fourni� J, Ch�tail M. 1982 Accumulation calcique au niveau cel-lulaire chez les mollusques. Proceedings Seventh International Malacological Congress, Coloque Calcium et Structures Sque-lettiques.Malacologia 22, 265?284.
4. Haszprunar G. 1996 The molluscan rhogocyte (pore-cell, blasen-zelle, cellule nucale), and its significance for ideas on nephridial evolution. J MollStu d62, 185?211.
5. Hopwood D. 1996 Fixation and fixatives. In: Bancroft JD, Stevens A, eds. Theory and Practice of Histological Techniques,4thed. Hong Kong: Churchill Livingstone: 23?46.