00789nam a2200193 a 450000500170000008200130001710000390003024501040006926000520017330000290022549000690025450001010032363000280042463000270045296400250047999700180050499900150052295200580053720251203090503.0  a510bGRO  aUniversity of the Witwatersrandd_  aGroup and semigroup rings: proceedings of the international conference on group and semigroup rings  aJohannesbrugbUniversity of Witwatersrandc1985  aviii, 267p .b22 cm.cPB  aNorth-Holland mathematics studiesd126=Notas de mathematicad111  aaInternational conference on group and semigroup and rings(1985: University of the Witwatersrand  aGroup rings, congresses  aSemigroups, congresses  bEngc100de010fg_  a10089 LIBSC C  c9312d9312  00104070aPUbPUd1998-04-08l0o510 GROp10089yBK