00261nam a2200121Ia 45000030006000000080041000060400015000471000014000622450025000762600009001015460012001100050017001220STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aLal, R.N.  aElements of topology  c1965  aEnglish20220125165939.0