Fixed point resolution in conformal field theory
  We summarize recent progress in the understanding of fixed point resolution for conformal field theories. Fixed points in both coset conformal field theories and non-diagonal modular invariants which describe simple current extensions of chiral algebras are investigated. A crucial role is played by the mathematical structures of twining characters and orbit Lie algebras. 
J. Fuchs, A.N. Schellekens, and C. Schweigert