1. I. V. Cherednik, Teor. Mat. Fiz.,61, No. 1, 35?44 (1984).
2. A. B. Zamolodchikov, Zh. Eksp. Teor. Fiz.,79, No. 2(8), 641?664 (1980).
3. R. P. Stanley, "On the number of reduced decompositions of elements of Coxeter groups," Preprint, Princeton Univ. (1985).
4. F. A. Berezin and I. M. Gel'fand, Tr. Mosk. Mat. Obshch.,5, 312?351 (1956).
5. Yu. I. Manin and V. V. Shekhtman, Proc. Int. Sem. "Group-theoretic methods in physics," Nauka, Moscow (1986).