00301nam a2200121Ia 45000030006000000080041000060400015000471000020000622450046000822600022001285460012001500050017001620STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aSneddon Ian, N.  aElements of partial diferential equations  bMcgraw hillc1987  aEnglish20220125165943.0