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@article{PMIHES_1966__30__5_0, author = {Cohn, Paul M.}, title = {On the structure of the $GL_2$ of a ring}, journal = {Publications Math\'ematiques de l'IH\'ES}, pages = {5--53}, publisher = {Institut des Hautes \'Etudes Scientifiques}, volume = {30}, year = {1966}, mrnumber = {207856}, zbl = {0144.26301}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PMIHES_1966__30__5_0/} }
Cohn, Paul M. On the structure of the $GL_2$ of a ring. Publications Mathématiques de l'IHÉS, Tome 30 (1966), pp. 5-53. http://geodesic.mathdoc.fr/item/PMIHES_1966__30__5_0/