00310nam a2200121Ia 45000030006000000080041000060400015000471000042000622450046001042600009001505460012001590050017001710STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aCoddinghton Earl, A.; Levinson Norman  aTheory of ordinary differential equations  c1977  aEnglish20220125165946.0