Geodesic
The problem of maximality of arithmetic subgroups in orthogonal groups of the type $B_n$
Matematičeskie zametki, Tome 16 (1974) no. 1, pp. 151-161.

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We obtain an explicit classification of the maximal arithmetic subgroups of decomposable orthogonal groups of type $B_n$ over the field of rational numbers or the field of rational functions of a single variable with a finite field of constants (of characteristic not equal to 2). In passing, we solve the problem concerning the classification of maximal compact subgroups of decomposable orthogonal groups of type $B_n$ over $Q_2$. 
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     author = {A. A. Bondarenko},
     title = {The problem of maximality of arithmetic subgroups in orthogonal groups of the type $B_n$},
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     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_1_a17/}
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A. A. Bondarenko. The problem of maximality of arithmetic subgroups in orthogonal groups of the type $B_n$. Matematičeskie zametki, Tome 16 (1974) no. 1, pp. 151-161. http://geodesic.mathdoc.fr/item/MZM_1974_16_1_a17/