@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://archive.numdam.org/item/PMIHES_1966__30__5_0/}
}