00333nam a2200121Ia 45000030006000000080041000060400015000471000017000622450085000792600018001645460012001820050017001940STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aSaxena, H.C.  aFinite differences and numerical analysis with appendices on difference equation  bS.Chandc1990  aEnglish20220125170044.0