@article{GDZPPN002068656, title = {Galois cohomology of biquadratic extensions.}, journal = {Commentarii mathematici Helvetici}, volume = {68}, year = {1993}, pages = {138-170}, zbl = {0781.12005}, url = {http://dml.mathdoc.fr/item/GDZPPN002068656} }
Tignol, J.-P.; Merkurjev, A.S. Galois cohomology of biquadratic extensions.. Commentarii mathematici Helvetici, Tome 68 (1993) pp. 138-170. http://gdmltest.u-ga.fr/item/GDZPPN002068656/