@article{GDZPPN002418975,
title = {Ulm Invariants of the Brauer Group of a Field.},
journal = {Mathematische Zeitschrift},
volume = {154},
year = {1977},
pages = {41-50},
zbl = {0334.20019},
url = {http://dml.mathdoc.fr/item/GDZPPN002418975}
}
Schacher, Murray; Fein, Burton. Ulm Invariants of the Brauer Group of a Field.. Mathematische Zeitschrift, Tome 154 (1977) pp. 41-50. http://gdmltest.u-ga.fr/item/GDZPPN002418975/