Determinant Formula for the Solutions of the Quantum   Knizhnik-Zamolodchikov Equation with |q|=1
  The fundamental matrix solution of the quantum Knizhnik-Zamolodchikov equation associated with quantum affine sl2 algebra is constructed for |q|=1. The formula for its determinant is given in terms of the double sine function. 
Tetsuji Miwa and Yoshihiro Takeyama