1. For a review, see I. Affleck, Conformal field theory approach to quantum impurity problems, preprint UBCTP-93-25 [cond-mat/9311054]
2. Solution of the Kondo problem
3. Exact results in the theory of magnetic alloys
4. Factorizing particles on a half-line and root systems
5. S. Ghoshal and A.B. Zamolodchikov, Boundary state and boundary S matrix in two-dimensional integrable field theory, Rutgers preprint RU-93-20 [hep-th/9306002]