1. T. Kerler, Quantum Groups, Quantum Categories and Quantum Field Theory, Ph.D. thesis, ETH, 1992.
2. J. Fröhlich and T. Kerler, Lecture Notes in Mathematics, Springer-Verlag, to appear.
3. J. Fröhlich and F. Gabbiani, Rev. Math. Phys. 2 (1990), 251.
4. F. Gabbiani, Braided Tensor Categories from an Algebraic Formulation of Conformai Field Theory, Ph.D. thesis, ETH (1992).
5. J. Fröhlich and F. Gabbiani, paper in preparation.