@article{SM_1972_18_2_a10,
     author = {L. N. Vaserstein},
     title = {On~the group $SL_2$ over {Dedekind} rings of arithmetic type},
     journal = {Sbornik. Mathematics},
     pages = {321--332},
     year = {1972},
     volume = {18},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1972_18_2_a10/}
}