@article{CMH_1994__69_4_140328,
     author = {Bruno Kahn},
     title = {On the cohomology of biquadratic extensions.},
     journal = {Commentarii mathematici Helvetici},
     pages = {120--136},
     publisher = {mathdoc},
     volume = {69},
     number = {4},
     year = {1994},
     zbl = {0798.12007},
     url = {http://geodesic.mathdoc.fr/item/CMH_1994__69_4_140328/}
}