1. I. Affleck, D. Gepner, HJ. Schulz, T. Ziman, J. Phys. A 22, 511, (1989).
2. For a review and notation see I. Affleck, Fields Strings and Critical Phenomena, (Ed. E. Brézin and J. Zinn-Justin, North-Holland, Amsterdam, 1990), 563.
3. J.L. Cardy, Nucl. Phys. B 324, 581 (1989); 270, 186 (1986).
4. For a review see I. Affleck, preprint cond-mat/9311054; Acta Physica Polonica B 26, 1869 (1995); preprint cond-mat/9512099.
5. S. Eggert, I. Affleck, Phys. Rev. B 46, 10866 (1992).