@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/}
}