@article {36594,
	title = {Revision of North American Agabus Leach (Coleptera: Dytiscidae) : introduction, key to species groups, and classification of ambigus-, tristis-, and arcticus- groups},
	volume = {121},
	year = {1989},
	pages = {861-919},
	publisher = {The Canadian Entomologist},
	author = {Larsen, D. J.}
}
