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Vermeulen, J. J. (1991). Notes on the non-marine molluscs of the island of Borneo 2. The genus Opisthostoma (Gastropoda Prosobranchia: Diplommatinidae). Basteria. 55: 139-163.
Vermeulen, J. J. (1991). Notes on the non-marine molluscs of the island of Borneo 2. The genus Opisthostoma (Gastropoda Prosobranchia: Diplommatinidae). Basteria. 55: 139-163.
