@article {44361,
	title = {Trumpeter swan numbers and distribution in western Canada, 1970-2000},
	volume = {25},
	year = {2002},
	pages = {8-21},
	publisher = {Waterbirds},
	url = {http://www.jstor.org/stable/1522329?seq=1},
	author = {Hawkings, James S. and Breault, Andre and Boyd, Sean and Norton, Mike and Beyersbergen and Latour, Paul}
}
