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	pages = {196-210},
	chapter = {196},
	author = {van Benthem-Jutting, W.S.S.}
}
@book {689,
	title = {Cyclophoridae},
	series = {Das Tierreich},
	volume = {16},
	year = {1902},
	pages = {662},
	publisher = {R. Friedl{\"a}nder und Sohn},
	organization = {R. Friedl{\"a}nder und Sohn},
	address = {Berlin},
	url = {http://biodiversitylibrary.org/item/16047$\#$page/456/mode/1up},
	author = {W. Kobelt}
}
@article {45,
	title = {The Malayan species of Opisthostoma (Gastropoda, Probranchia, Cyclophoridae), with a catalogue of all the species hitherto described},
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	volume = {24},
	year = {1952},
	pages = {5-61},
	chapter = {5},
	url = {http://rmbr.nus.edu.sg/rbz/biblio/24/24brm005-062.pdf},
	author = {van Benthem-Jutting, W.S.S.}
}
@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}
}
