@article {47414,
	title = {Sources of nitrogen in Alberta. CASA Science Symposium on nitrogen : Fixed on nitrogen},
	year = {2006},
	pages = {23},
	institution = {Environment Canada, Science \& Technology Branch},
	url = {http://www.casahome.org/wp-content/uploads/2007/06/4-4-David-Niemi-\%20Sources-of-N-in-AB.pdf},
	author = {Niemi, David}
}
