@book{AST_1988__159-160__1_0,
     author = {Mathieu, Olivier},
     title = {Formules de caract\`eres pour les alg\`ebres de {Kac-Moody} g\'en\'erales},
     series = {Ast\'erisque},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {159-160},
     year = {1988},
     mrnumber = {980506},
     zbl = {0683.17010},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1988__159-160__1_0/}
}