@article {227,
	title = {On the land-shells of the Natuna Islands},
	journal = {The annals and magazine of natural history, including zoology, botany and geology},
	volume = {6},
	year = {1894},
	pages = {453-463},
	chapter = {453},
	url = {http://www.biodiversitylibrary.org/item/63421$\#$page/508/mode/1up},
	author = {E.A. Smith}
}
@article {229,
	title = {Non-marine mollusks of Borneo II Pulmonata Pupi, III Prosobranchia Hydrocenidae, Helicinidae},
	journal = {Bulletin of the Florida State Museum. Biological sciences},
	volume = {29},
	year = {1983},
	pages = {102-152},
	chapter = {102},
	url = {http://ufdc.ufl.edu/UF00095805/00001/3j},
	author = {F.G. Thompson and S.P. Dance}
}
