00294nam a2200121Ia 45000030006000000080041000060400015000471000027000622450045000892600009001345460012001430050017001550STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aBergmann Peter Gabriel  aIntroduction to the theory of relativity  c1969  aEnglish20220125170139.0