Geodesic
Normality of elementary subgroup in~$\operatorname{Sp}(2,A)$
Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 29, Tome 443 (2016), pp. 33-45

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Let $A$ be a ring with involution (associative, with identity), $e_1,\dots,e_n$ be a full system of hermitian idempotents in $A$ such that every $e_i$ generates $A$ as a two-sided ideal. This paper proves normality of the elementary subgroup in $\operatorname{Sp}(2,A)$ if $n\ge3$ and $A$ satisfies an analog of local stable rank condition. 
@article{ZNSL_2016_443_a3,
     author = {E. Yu. Voronetsky},
     title = {Normality of elementary subgroup in~$\operatorname{Sp}(2,A)$},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {33--45},
     publisher = {mathdoc},
     volume = {443},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2016_443_a3/}
}
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E. Yu. Voronetsky. Normality of elementary subgroup in~$\operatorname{Sp}(2,A)$. Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 29, Tome 443 (2016), pp. 33-45. http://geodesic.mathdoc.fr/item/ZNSL_2016_443_a3/