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Vermeulen, J. J. (1990). Notes on the non-marine molluscs of the island of Borneo 1. The genus Diaphera (Gastropoda Pulmonata Streptaxidae). Basteria. 54: 159-165. Leiden.
Vermeulen, J. J. (1990). Notes on the non-marine molluscs of the island of Borneo 1. The genus Diaphera (Gastropoda Pulmonata Streptaxidae). Basteria. 54: 159-165. Leiden.
