00293nam a2200121Ia 45000030006000000080041000060400015000471000020000622450051000822600009001335460012001420050017001540STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aFrederich Erwin  aFoundations of Einsteens theory of gravitation  c1924  aEnglish20220125170110.0