00000nam a2200000 a 4500 20251203090503.0 510 GRO University of the Witwatersrand _ Group and semigroup rings: proceedings of the international conference on group and semigroup rings Johannesbrug University of Witwatersrand 1985 viii, 267p . 22 cm. PB North-Holland mathematics studies 126=Notas de mathematica 111 aInternational conference on group and semigroup and rings(1985: University of the Witwatersrand Group rings, congresses Semigroups, congresses Eng 100 010 _ 10089 LIBSC C 9312 9312 0 0 0 0 PU PU 1998-04-08 0 510 GRO 10089 BK