00364nam a2200133 a 450000500170000008200160001710000170003324500380005026000280008830000290011649000340014563000300017963000210020920251203091010.0  a512.74bFRO  aFrohlich, A.  aClassgroups and hermitian modules  aBostonbIrkhauserc1984  axvii, 226p.b22 cm.cPB.  aProgress in mathematicsdv.48  aClass groups, mathematics  amodules, algebra