LEADER 00666nam0-22002531i-450- 001 990001291310403321 035 $a000129131 035 $aFED01000129131 035 $a(Aleph)000129131FED01 035 $a000129131 100 $a20000920d1987----km-y0itay50------ba 101 0 $aeng 200 1 $aFree group rings$eNarain Gupta 205 $a$a 210 $aProvidence (RI)$cAmerican Mathematical Society$d1987 225 1 $aContemporary mathematics$v66 801 0$aIT$bUNINA$gRICA$2UNIMARC 901 $aBK 912 $a990001291310403321 952 $aC-1-(66$b3957$fMA1 959 $aMA1 996 $aFree group rings$9383922 997 $aUNINA DB $aING01