@article{IM_1984__78_143173,
     author = {Bruno Kahn},
     title = {Classes de {Stiefel-Whitney} de {Formes} quadratiques et de repr\'esentations galoisiennes r\'eelles.},
     journal = {Inventiones mathematicae},
     pages = {223--256},
     publisher = {mathdoc},
     volume = {78},
     year = {1984},
     zbl = {0557.12014},
     url = {http://geodesic.mathdoc.fr/item/IM_1984__78_143173/}
}