Remarks on Non-Abelian Duality
  A class of two-dimensional globally scale-invariant, but not conformally invariant, theories is obtained. These systems are identified in the process of discussing global and local scaling properties of models related by duality transformations, based on non-semisimple isometry groups. The construction of the dual partner of a given model is followed through; non-local as well as local versions of the former are discussed. 
S. Elitzur, A. Giveon, E. Rabinovici, A. Schwimmer and G. Veneziano