no. 2
On normal subgroups of GL 2 over rings with many units
Compositio Mathematica, Tome 74 (1990) no. 2, pp. 157-164. 
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     title = {On normal subgroups of $\mathrm {GL}_2$ over rings with many units},
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     pages = {157--164},
     publisher = {Kluwer Academic Publishers},
     volume = {74},
     number = {2},
     year = {1990},
     mrnumber = {1047737},
     zbl = {0697.20040},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1990__74_2_157_0/}
}
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Vaserstein, L. N. On normal subgroups of $\mathrm {GL}_2$ over rings with many units. Compositio Mathematica, Tome 74 (1990) no. 2, pp. 157-164. http://archive.numdam.org/item/CM_1990__74_2_157_0/

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