@article{PMIHES_1966__30__5_0,
     author = {Paul M. Cohn},
     title = {On the structure of the $GL_2$ of a ring},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {5--53},
     year = {1966},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {30},
     doi = {10.1007/BF02684355},
     mrnumber = {207856},
     zbl = {0144.26301},
     language = {en},
     url = {https://pmihes.centre-mersenne.org/articles/10.1007/BF02684355/}
}