@article {40440,
	title = {Genetic variation in populations of the endemic Achillea millefolium subs. Megacephala from the Athabasca sand dunes and the widespread subsp. lanulosa in western North America},
	volume = {74},
	year = {1996},
	pages = {1138-1146},
	publisher = {Canadian Journal of Botany},
	url = {http://article.pubs.nrc-cnrc.gc.ca/RPAS/RPViewDoc?_handler_=HandleInitialGet\&calyLang=eng\&journal=cjb\&volume=74\&articleFile=b96-138.pdf},
	author = {Purdy, B. G. and Bayer, R. J.}
}
