@article{MZM_1969_6_3_a10,
     author = {N. S. Romanovskii},
     title = {Subgroups between special linear groups over a~ring and its subring},
     journal = {Matemati\v{c}eskie zametki},
     pages = {335--345},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_6_3_a10/}
}