Abelian Bosonization, the Wess-Zumino Functional and Conformal Symmetry
  We look at the equivalence of the massive Thirring and sine-Gordon models. Previously, this equivalence was derived perturbatively in mass (though to all orders). Our calculation goes beyond that and uncovers an underlying conformal symmetry. 
A. Bogojevic, B. Sazdovic (Belgrade, Inst. Phys.) and O. Miskovic   (Vinca Inst.)