Geodesic
Subgroups between special linear groups over a~ring and its subring
Matematičeskie zametki, Tome 6 (1969) no. 3, pp. 335-345.

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All the subgroups between the special linear groups $SL(n,o)$ and $SL(n,O)$ are described in the following two cases: 1) $o$ is a real-closed field, and $O$ is its algebraic closure; 2)  $o$ is a Euclidean ring, and $O$ is its quotient field. 
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     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},
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     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_6_3_a10/}
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N. S. Romanovskii. Subgroups between special linear groups over a~ring and its subring. Matematičeskie zametki, Tome 6 (1969) no. 3, pp. 335-345. http://geodesic.mathdoc.fr/item/MZM_1969_6_3_a10/