Geodesic
Parabolic congruence subgroups in linear groups
Zapiski Nauchnykh Seminarov POMI, Rings and modules, Tome 64 (1976), pp. 55-63

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Parabolic subgroups are described for the full and special linear groups over $a$ commutative ring $R$ which contain a principal congruence level a, where a is an ideal of $R$ such that $R/a$ is semilocal. It is assumed that $R$ is generated additively by its invertible elements and that the ring identity can be expressed as a sum of two invertible elements. 
@article{ZNSL_1976_64_a4,
     author = {N. A. Vavilov},
     title = {Parabolic congruence subgroups in linear groups},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {55--63},
     publisher = {mathdoc},
     volume = {64},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_64_a4/}
}
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N. A. Vavilov. Parabolic congruence subgroups in linear groups. Zapiski Nauchnykh Seminarov POMI, Rings and modules, Tome 64 (1976), pp. 55-63. http://geodesic.mathdoc.fr/item/ZNSL_1976_64_a4/