1. H. Bass, A non-triangular action of G
a
on A3, J. of Pure and Applied Algebra 33 (1984), 1–5.
2. G. Freudenburg, On tameness and triangulability of polynomial automorphisms, preprint.
3. H.W.E. Jung, Über ganze birationale Transformationen der Ebene, J. Reine Angew. Math. 184 (1942), 161–174.
4. H. Kraft, Algebraic automorphisms of affine spaces, Topological methods in algebraic transformation groups (H. Kraft, T. Petrie, and G.W. Schwarz, eds.), Progress in Math., vol. 80, Birkhäuser, Boston-Basel-Berlin, 1989, proceedings from the conference `Topological Methods in Algebraic Transformation Groups’ held at Rutgers University, 4–8 April, 1988.
5. W. van der Kulk, On polynomial rings in two variables, Nieuw Archief voor Wiskunde 3 (1953), no. 1, 33–41.