00269nam a2200097Ia 4500008004100000020001800041040002500059082002400084245002900108260003400137240819s9999    xx            000 0 und d  a9781984637352  aNORSU-DumcNORSU-Dum  aRes/512.72/El2/2020 0aElementary number theory  bNew York: 3G E-learningc2020