Geodesic
Parabolic subgroups of Chevalley groups over a commutative ring
Zapiski Nauchnykh Seminarov POMI, Integral lattices and finite linear groups, Tome 116 (1982), pp. 20-43 
N. A. Vavilov. Parabolic subgroups of Chevalley groups over a commutative ring. Zapiski Nauchnykh Seminarov POMI, Integral lattices and finite linear groups, Tome 116 (1982), pp. 20-43. http://geodesic.mathdoc.fr/item/ZNSL_1982_116_a2/
@article{ZNSL_1982_116_a2,
     author = {N. A. Vavilov},
     title = {Parabolic subgroups of {Chevalley} groups over a commutative ring},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {20--43},
     year = {1982},
     volume = {116},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1982_116_a2/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

This is a survey of results describing the parabolic subgroups of Chevalley groups over rings of various types. For Chevalley groups of classical types over an arbitrary commutative ring, a description of parabolic subgroups is obtained which may be considered definitive. Some errors in the results of V. M. Levchuk in Mat. Zametki, Volume 31, No. 4 (1982) are pointed out.