00359nam a2200121 a 450000500170000002000150001708200150003210000060004724500880005326000340014130000210017549000410019620251203092423.0  a3540527451  a510.8bCOM  d_  aCommunicative AlgebrabProceedings of a Workshop Held in Salvador, Brazil, Aug.8-17  aNew YorkbSpring-Verlagc1990  a160p.c24 cm. PB  aLecture Notes in Mathematicsdv.1430