@article {2768,
	title = {North American Tychius: new synonymy and observations on phylogeny and zoogeography (Coleoptera: Curculionidae)},
	journal = {Entomologica Scandinavica},
	volume = {8},
	number = {4},
	year = {1977},
	pages = {287-300},
	author = {Clark, W.E.}
}
@article {2721,
	title = {The curculionid genus Tychius Germar: natural history and coevolution with leguminous host plants},
	journal = {The Southwestern Entomologist},
	volume = {2},
	number = {3},
	year = {1977},
	pages = {106-120},
	author = {Clark, W.E. and Burke, H.R.}
}
