Regular basis and R-matrices for the su(n)_k Knizhnik-Zamolodchikov   equation
  Dynamical R-matrix relations are derived for the group-valued chiral vertex operators in the SU(n) WZNW model from the KZ equation for a general four-point function including two step operators. They fit the exchange relations for the U_q(sl_n) covariant quantum matrix derived previously by solving the dynamical Yang-Baxter equation. As a byproduct, we extend the regular basis introduced earlier for SU(2) chiral fields to SU(n) step operators and display the corresponding triangular matrix representation of the braid group. 
L.K. Hadjiivanov, Ya.S. Stanev and I.T. Todorov