00300nam a2200133Ia 45000030006000000080041000060400015000471000022000622450033000842500011001172600009001285460012001370050017001490STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aLynn Arthur Steen  aCounter examples in topology  aSecond  c1986  aEnglish20220125165940.0