00249nam a2200097Ia 4500008004100000020001800041040002500059082002300084245002000107260002400127240807s9999    xx            000 0 und d  a9781984637383  aNORSU-DumcNORSU-Dum  aRes/513.5/M72/2020 0aModern geometry  b3G E-learningc2020