@incollection{AST_1991__198-199-200__41_0,
     author = {Berg\'e, A.-M. and Martinet, J.},
     title = {R\'eseaux extr\^emes pour un groupe d'automorphismes},
     booktitle = {Journ\'ees arithm\'etiques de Luminy 17-21 Juillet 1989},
     editor = {Lachaud Gilles},
     series = {Ast\'erisque},
     pages = {41--66},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {198-199-200},
     year = {1991},
     mrnumber = {1144311},
     zbl = {0753.11026},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1991__198-199-200__41_0/}
}