Semisimple algebraic groups which are split over a~quadratic extension
Izvestiya. Mathematics , Tome 5 (1971) no. 1, pp. 57-72

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We consider algebraic groups defined over a field $k$ and containing a maximal torus $T$ which is defined and anisotropic over $k$ and split over a given quadratic extension $K$ of $k$. We study certain structural features of such groups, and the results obtained are used to investigate the behavior of these groups over special fields.
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     author = {B. Yu. Weisfeiler},
     title = {Semisimple algebraic groups which are split over a~quadratic extension},
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     number = {1},
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     language = {en},
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}
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B. Yu. Weisfeiler. Semisimple algebraic groups which are split over a~quadratic extension. Izvestiya. Mathematics , Tome 5 (1971) no. 1, pp. 57-72. http://geodesic.mathdoc.fr/item/IM2_1971_5_1_a3/