@book{AST_1997__246__R1_0, author = {Tarasov, V. and Varchenko, A.}, title = {Geometry of $q$-hypergeometric functions, quantum affine algebras and elliptic quantum groups}, series = {Ast\'erisque}, publisher = {Soci\'et\'e math\'ematique de France}, number = {246}, year = {1997}, mrnumber = {1646561}, zbl = {0938.17012}, language = {en}, url = {http://archive.numdam.org/item/AST_1997__246__R1_0/} }