00285nam a2200121Ia 45000030006000000080041000060400015000471000018000622450045000802600009001255460012001340050017001460STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aForsyth, A.R.  aTheory of differential equations part IV  c1959  aEnglish20220125165949.0