@article {548,
	title = {Vergleichende Anatomie, Phylogenie und historische Biogeographie der Ampullariidae (Mollusca, Gastropoda)},
	journal = {Abhandlungen des Naturwissenschaftlichen Vereins in Hamburg},
	volume = {NF},
	year = {1991},
	pages = {311-338},
	author = {Berthold, T}
}
@article {547,
	title = {Comparative conchology and functional morphology of the copulatory organ of the Ampullariidae (Gastropoda, Monotocardia) and their bearing upon phylogeny and palaeontology.},
	journal = {Abhandlungen des Naturwissenschaftlichen Vereins in Hamburg},
	volume = {NF},
	year = {1989},
	pages = {141-164},
	author = {Berthold, T}
}
