@article {26,
	title = {Cancellation theorem},
	journal = {Doc. Math.},
	year = {2010},
	pages = {671{\textendash}685},
	issn = {1431-0635},
	url = {http://www.math.uiuc.edu/documenta/vol-suslin/voevodsky.html},
	author = {Voevodsky, Vladimir}
}
