@incollection{MSMF_1974__37__91_0,
     author = {Gras, Georges},
     title = {Probl\`emes relatifs aux $l$-classes d{\textquoteright}id\'eaux dans les extensions cycliques relatives de degr\'e premier $l$},
     booktitle = {Journ\'ees arithm\'etiques (Grenoble, 1973)},
     series = {M\'emoires de la Soci\'et\'e Math\'ematique de France},
     pages = {91--100},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {37},
     year = {1974},
     doi = {10.24033/msmf.134},
     mrnumber = {51 #12791},
     zbl = {0288.12003},
     url = {http://www.numdam.org/articles/10.24033/msmf.134/}
}