@article {6383,
	title = {Palearctic freshwater mussel (Mollusca: Bivalvia: Unionoida) diversity and the Comparatory Method as a species concept},
	journal = {Proceedings of the Academy of Natural Sciences of Philadelphia},
	volume = {156},
	year = {2007},
	note = {PDF},
	pages = {71-88},
	keywords = {bivalvia, mollusca, morphometrics, species concepts, unionoida},
	author = {Graf, D. L.}
}
