Conformal Field Theories: From Old to New - A short review of recent work, including the general problem of constructing the actions of new conformal field theories from old conformal field theories.[Postscript] - http://arxiv.org/abs/hep-th/9802079
Conformal Field Theory: a case study - This is a set of introductory lecture notes devoted to the Wess-Zumino-Witten model of two-dimensional conformal field theory. - http://xxx.uni-augsburg.de/abs/hep-th/9904145