@article {35, title = {Notes on the non-marine molluscs of the island of Borneo. 6. The genus Opisthostoma (Gastropoda Prosobranchia: Diplommatinidae), part 2}, journal = {Basteria}, volume = {58}, year = {1994}, pages = {73-191}, chapter = {73}, author = {J.J. Vermeulen} } @article {vermeulen1996notes, title = {Notes on the non-marine molluscs of the island of Borneo 8. The genus Arinia; additions to the genera Diplommatina and Opisthostoma (Gastropoda Prosobranchia: Diplommatinidae)}, journal = {Basteria}, volume = {60}, year = {1996}, pages = {87{\textendash}138}, publisher = {NETHERLANDS MALACOLOGICAL SOCIETY}, author = {J.J. Vermeulen} }