@article {45391,
	title = {Herbage yield losses in perennial pasture due to Canada thistle (Cirsium arvense)},
	volume = {18},
	year = {2004},
	pages = {784-794},
	publisher = {Weed Technology},
	url = {http://www.bioone.org/archive/0890-037X/19/2/pdf/i0890-037X-19-2-298.pdf},
	author = {Grekul, Chad W. and Bork, Edward W.}
}
