@mastersthesis {33740,
	title = {Classification, phylogeny and zoogeography of the world species of Dytiscus Linnaeus (Coleoptera: Dytiscidae)},
	volume = {Entomology},
	year = {1983},
	address = {University of Alberta},
	keywords = {entomology, insecta},
	url = {http://search.proquest.com/docview/193731697},
	author = {Roughley, R. E.}
}
