00316nam a2200121Ia 45000030006000000080041000060400015000471000019000622450053000812600031001345460012001650050017001770STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aNewman, M.H.A.  aElements of the topology of plane sets of points  bCambridge universityc1964  aEnglish20220125165939.0