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Abstract
Liouville, SL(2,R)/U(1) and SL(2,R)/R_+ coset structures are completely
described by gauge invariant Hamiltonian reduction of the SL(2,R) WZNW theory.
Comments 4 Pages, Latex, Talk at XXIXth International Colloquium on Group
Theoretical Methods in Physics, July 15-20, 2002, Paris, France, spelling
mistakes corrected