J. J.  Vermeulen, ?Notes on the non-marine molluscs of the island of Borneo 7. The genus Niahia gen. nov.?, Basteria, vol. 60, pp. 67-69, 1996.

J. J.  Vermeulen, ?Notes on the non-marine molluscs of the island of Borneo 8. The genus Arina additions to the genera Diplommatina and Opisthostoma?, Basteria, vol. 60, pp. 87-138, 1996.