00269nam a2200121Ia 45000030006000000080041000060400015000471000022000622450025000842600009001095460012001180050017001300STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aGordon Thomas, W.  aTopological analysis  c1958  aEnglish20220125165938.0