Quantum Knizhnik--Zamolodchikov equation for $U_q (\widehat{ sl_n})$ and   integral formula
  Presented is an integral formula for solutions to the quantum Knizhnik--Zamolodchikov equation of level $0$ associated with the vector representation of $U_q (\widehat{ sl_n})$. This formula gives a generalization of both our previous work for $U_q (\widehat{ sl_2})$ and Smirnov's formula for form factors of $SU(n)$ chiral Gross-Neveu model. 
T. Kojima and Y.H. Quano