00308nam a2200121Ia 4500082001700000100002400017245004800041260003400089300001400123490003900137500000500176700000500181  a512bP288.GR  aPassi, Inder Bir S.  aGroup rings and their augmentation idealsb  aBerlinbSpringer-Verlagc1979  avi, 137p.  aLecture notes in Mathematicsv 715  a  a