00255nam a2200097Ia 4500008004100000020001800041040002500059082002100084245002800105260002400133240807s9999    xx            000 0 und d  a9781984637062  aNORSU-DumcNORSU-Dum  aRes/540/P93/2020 0aPrinciples of chemistry  b3G E-Learningc2020