Geodesic
Abnormal subgroups of classical groups corresponding to closed sets of roots
Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 18, Tome 365 (2009), pp. 151-171
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In this paper we classify abnornal subgroups in classical Chevalley groups, containing split maximal torus. Classification problem is reduced to a combinatorial problem in terms of root systems, which is solved with use of weight graphs. Bibl. – 5 titles. 
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N. V. Gravin; D. Yu. Shiryaev. Abnormal subgroups of classical groups corresponding to closed sets of roots. Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 18, Tome 365 (2009), pp. 151-171. http://geodesic.mathdoc.fr/item/ZNSL_2009_365_a7/

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