Geodesic
On special congruence subgroups of symplectic groups
Matematičeskie zametki, Tome 80 (2006) no. 5, pp. 770-772.

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In this paper, it is proved that every special congruence subgroup $SSp(V,I)$ of the symplectic group $Sp(V(R))$, where $R$ is a ring of stable rank $1$ with invertible element $2$ and $\dim V(R)\ge 4$, is generated by the symplectic transvections belonging to this subgroup. This result is used to obtain the complete description of the normal subgroups of $Sp(V(R))$. 
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     author = {S. Tazhetdinov},
     title = {On special congruence subgroups of symplectic groups},
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S. Tazhetdinov. On special congruence subgroups of symplectic groups. Matematičeskie zametki, Tome 80 (2006) no. 5, pp. 770-772. http://geodesic.mathdoc.fr/item/MZM_2006_80_5_a11/

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