00313nam a2200121Ia 45000030006000000080041000060400015000471000019000622450061000812600020001425460012001620050017001740STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aShtokalo, I.Z.  aLinear differential equations with variable coefficients  bHindustanc1961  aEnglish20220125165943.0