Logarithmic Operators and Dynamical Extention of The Symmetry Group in   the Bosonic SU(2)_0 and SUSY SU(2)_2 WZNW Models
  We study the operator product expansion in the bosonic $SU(2)_0$ and SUSY $SU(2)_2$ WZNW models. We find that these OPEs contain both logarithmic operators and new conserved currents, leading to an extension of the symmetry group. 
J.-S. Caux, I. Kogan, A. Lewis and A. M. Tsvelik (Oxford University)