00305nam a2200121Ia 45000030006000000080041000060400015000471000042000622450041001042600009001455460012001540050017001660STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aNational Council of Science Education  aJournal of Physics Education January  c1979  aEnglish20220125165829.0