@incollection{AST_1977__41-42__239_0,
     author = {Neumann, Olaf},
     title = {On maximal $p$-extensions, class numbers and unit signatures},
     booktitle = {Journ\'ees arithm\'etiques de Caen},
     series = {Ast\'erisque},
     pages = {239--246},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {41-42},
     year = {1977},
     mrnumber = {441920},
     zbl = {0352.12010},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1977__41-42__239_0/}
}