Geodesic
On the group $SL_2$ over Dedekind rings of arithmetic type
Sbornik. Mathematics, Tome 18 (1972) no. 2, pp. 321-332 Cet article a éte moissonné depuis la source Math-Net.Ru

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It is proved that the group of matrices of order two with determinant 1 over a Dedekind ring of arithmetic type is generated by elementary matrices if there are infinitely many invertible elements in this ring. We also obtain a more general result, describing the group generated by elementary matrices belonging to a congruence subgroup. Bibliography: 6 titles. 
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     author = {L. N. Vaserstein},
     title = {On~the group $SL_2$ over {Dedekind} rings of arithmetic type},
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L. N. Vaserstein. On the group $SL_2$ over Dedekind rings of arithmetic type. Sbornik. Mathematics, Tome 18 (1972) no. 2, pp. 321-332. http://geodesic.mathdoc.fr/item/SM_1972_18_2_a10/

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