00346nam a2200145Ia 45000030006000000080041000060400015000471000020000622450035000822500006001172600042001233000006001655460012001710050017001830STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aVasishtha, A.R.  aPartial Differential Equations  a5  bKrishna Prakashan Media; Meerutc2004  a0  aEnglish20220125165946.0