@article {44735,
	title = {Migration chronology of eastern-population Tundra swans},
	volume = {81},
	year = {2003},
	pages = {861-870},
	publisher = {Canadian Journal of Zoology},
	url = {http://article.pubs.nrc-cnrc.gc.ca/RPAS/RPViewDoc?_handler_=HandleInitialGet\&calyLang=eng\&journal=cjz\&volume=82\&articleFile=z04-128.pdf},
	author = {Petrie, S. A. and Wilcox, K. L.}
}
