Geodesic
Subgroups of the orthogonal groups of even degree over a~local field
Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 12, Tome 321 (2005), pp. 240-250

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In this paper, we obtain the description of subgroups of orthogonal linear groups $\operatorname{SO}(2l,K)$ and $\operatorname{GO}(2l,K)$ over the field of fractions $K$ of a local principal ideal domain $R$ containing the maximal split tori $T=T(2l,R)$ with entries from $R$. Similar result for overgroups $T$ in case of semilocal ring and field was obtained earlier by N. Vavilov. Result of the present paper generalizes also some known results. 
@article{ZNSL_2005_321_a12,
     author = {K. Yu. Lavrov},
     title = {Subgroups of the orthogonal groups of even degree over a~local field},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {240--250},
     publisher = {mathdoc},
     volume = {321},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2005_321_a12/}
}
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K. Yu. Lavrov. Subgroups of the orthogonal groups of even degree over a~local field. Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 12, Tome 321 (2005), pp. 240-250. http://geodesic.mathdoc.fr/item/ZNSL_2005_321_a12/