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@article{IM_1988__91_3_143553, author = {B.A. Magurn and W. Van der Kallen}, title = {Absolute stable rank and {Witt} cancellation for noncommutative rings.}, journal = {Inventiones mathematicae}, pages = {525--542}, publisher = {mathdoc}, volume = {91}, number = {3}, year = {1988}, zbl = {0639.16015}, url = {http://geodesic.mathdoc.fr/item/IM_1988__91_3_143553/} }
B.A. Magurn; W. Van der Kallen. Absolute stable rank and Witt cancellation for noncommutative rings.. Inventiones mathematicae, Tome 91 (1988) no. 3, pp. 525-542. http://geodesic.mathdoc.fr/item/IM_1988__91_3_143553/