T-Duality in Affine NA Toda Models
  The construction of Non Abelian affine Toda models is discussed in terms of its underlying Lie algebraic structure. It is shown that a subclass of such non conformal two dimensional integrable models naturally leads to the construction of a pair of actions which share the same spectra and are related by canonical transformations. 
J.F. Gomes, G.M. Sotkov and A.H. Zimerman