00279nam a2200121Ia 45000030006000000080041000060400015000471000019000622450027000812600020001085460012001280050017001400STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aElsgolts, L.E.  aDifferential equations  bHindustanc1961  aEnglish20220125165942.0