Geodesic
Intermediate subgroups of the Steinberg groups over the field of fractions of a principal ideal ring
Vladikavkazskij matematičeskij žurnal, Tome 12 (2010) no. 4, pp. 60-66 
T. V. Moiseenkova; J. N. Nuzhin. Intermediate subgroups of the Steinberg groups over the field of fractions of a principal ideal ring. Vladikavkazskij matematičeskij žurnal, Tome 12 (2010) no. 4, pp. 60-66. http://geodesic.mathdoc.fr/item/VMJ_2010_12_4_a8/
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is described Intermediate subgroups of the Steinberg groups of type $^2A_{2l-1}$, $^2D_l$, $^2E_6$, $^3D_4$ over the field of fractions of a principal ideal ring are described under some restrictions on the ring.

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