00278nam a2200109Ia 4500008004100000020001800041082001500059100001700074245002600091260004300117300000800160190710s9999    xx            000 0 und d  a0-486-64023-X  a512.81 C66  aCohn, Harvey 0aAdvancd number theory  aNew YorkbDover Publications Incc1980  a275