00386nam a2200109 a 450000500170000008200170001710000240003424500520005826000520011030000220016249000920018420251203090503.0  a510,bD, pas  aPassman, Donald, S.  aGroup rings, crossed products and galois theory  aProvidence: American Mathematical societyc1986  aviii, 71p, 22 cm.  aRegional conference series in mathematics/Conference Board of Mathematical sciencesd64