00302nam a2200121Ia 45000030006000000080041000060400015000471000042000622450038001042600009001425460012001510050017001630STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aNational Council of Science Education  aJournal of Physics Education July  c1974  aEnglish20220125165829.0