On quantum equivalence of dual sigma models: $SL(3)$ examples
  The equivalence of several $SL(3)$ sigma models and their special Abelian duals is investigated in the two loop order of perturbation theory. The investigation is based on extracting and comparing various $\beta$ functions of the original and dual models. The role of the discrete global symmetries is emphasized. 
Z. Horv\'ath, R.L. Karp and L. Palla