NB pdf
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Wouters-1989-Proceedings of the Symposium Invertebrates of Belgium-119-124.pdf
- De Smet, W.H. & Van Rompu, E.A. 1989. Survey of the distribution and shell polymorphism of Cochlicella acuta (Müller, 1774) and Theba pisana (Müller, 1774) (Pulmonata, Helicidae) along the Belgian coastal dune area. Invertebraten van Begië - Invertébrés de Belgique: 119-124