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Gerber, J. (1996). Revision der Gattung Vallonia Risso 1826 (Mollusca: Gastropoda: Valloniidae). Schriften zur Malakozoologie. 8: 1-227. Cismar [20 February].
Gerber, J. (1996). Revision der Gattung Vallonia Risso 1826 (Mollusca: Gastropoda: Valloniidae). Schriften zur Malakozoologie. 8: 1-227. Cismar [20 February].