@article{GDZPPN002202611,
title = {Orthogonal representations of Galois groups, Stiefel-Whitney classes and Hasse-Witt invariants.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {358},
year = {1985},
pages = {84-123},
zbl = {0556.12005},
url = {http://dml.mathdoc.fr/item/GDZPPN002202611}
}
Fröhlich, A. Orthogonal representations of Galois groups, Stiefel-Whitney classes and Hasse-Witt invariants.. Journal für die reine und angewandte Mathematik, Tome 358 (1985) pp. 84-123. http://gdmltest.u-ga.fr/item/GDZPPN002202611/