Stably co-tame polynomial automorphisms over commutative rings
  We say that a polynomial automorphism $\phi $ in $n$ variables is stably co-tame if the tame subgroup in $n$ variables is contained in the subgroup generated by $\phi $ and affine automorphisms in $n+1$ variables. In this paper, we give conditions for stably co-tameness of polynomial automorphisms. 
Shigeru Kuroda
math.AC math.AG math.GR