@incollection{AST_1973__4__27_0,
     author = {Guivarc'h, Yves and Keane, Michael},
     title = {Transience des marches al\'eatoires sur les groupes nilpotents},
     booktitle = {S\'eminaire KGB sur les marches al\'eatoires},
     series = {Ast\'erisque},
     pages = {27--36},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {4},
     year = {1973},
     mrnumber = {483027},
     zbl = {0271.60012},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1973__4__27_0/}
}