@article{10_4153_CMB_1987_024_6,
     author = {Mason, A. W.},
     title = {On {GL2} of a {Local} {Ring} in {Which} 2 is {Not} a {Unit}},
     journal = {Canadian mathematical bulletin},
     pages = {165--176},
     year = {1987},
     volume = {30},
     number = {2},
     doi = {10.4153/CMB-1987-024-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1987-024-6/}
}