@article{AIF_1979__29_1_107_0,
     author = {Gras, Marie-Nicole},
     title = {Classes et unit\'es des extensions cycliques r\'eelles de degr\'e 4 de ${\bf Q}$},
     journal = {Annales de l'Institut Fourier},
     pages = {107--124},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {29},
     number = {1},
     year = {1979},
     doi = {10.5802/aif.729},
     mrnumber = {81f:12003},
     zbl = {0387.12001},
     language = {fr},
     url = {http://www.numdam.org/articles/10.5802/aif.729/}
}