00273nam a2200109Ia 4500082001900000100002100019245004900040260003600089300002800125500000500153700000500158  a512.7bR484.TL  aRibenboim, Paulo  aThirteen lectures on Fermat's last theoremb  aNew YorkbSpringer-Verlagc1979  axvi, 302p. Index, Bibl.  a  a