00666nam0-22002531i-450-990001291310403321000129131FED01000129131(Aleph)000129131FED0100012913120000920d1987----km-y0itay50------baengFree group ringsNarain GuptaProvidence (RI)American Mathematical Society1987Contemporary mathematics66ITUNINARICAUNIMARCBK990001291310403321C-1-(663957MA1MA1Free group rings383922UNINAING01