Geodesic
Nonsimplicity of the group of unimodular automorphisms of the affine plane
Matematičeskie zametki, Tome 15 (1974) no. 2, pp. 289-293 
V. I. Danilov. Nonsimplicity of the group of unimodular automorphisms of the affine plane. Matematičeskie zametki, Tome 15 (1974) no. 2, pp. 289-293. http://geodesic.mathdoc.fr/item/MZM_1974_15_2_a14/
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     title = {Nonsimplicity of the group of unimodular automorphisms of the affine plane},
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is proven that the group of automorphisms of the affine plane (as an algebraic manifold), with Jacobian equal to 1, is not simple.