On solutions of the KZ and qKZ equations at level zero

Nakayashiki, A.; Pakuliak, S.; Tarasov, V.

Annales de l'I.H.P. Physique théorique, Volume 71 (1999) p. 459-496

Geometry of $q$-hypergeometric functions, quantum affine algebras and elliptic quantum groups

Tarasov, V.; Varchenko, A.

Astérisque, (1997)