@article{CMH_1993__68_2_140297,
     author = {J.-P. Tignol and A.S. Merkurjev},
     title = {Galois cohomology of biquadratic extensions.},
     journal = {Commentarii mathematici Helvetici},
     pages = {138--170},
     publisher = {mathdoc},
     volume = {68},
     number = {2},
     year = {1993},
     zbl = {0781.12005},
     url = {http://geodesic.mathdoc.fr/item/CMH_1993__68_2_140297/}
}