@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}
}
