00333nam a2200133Ia 4500100002900000650002700029250000600056366000700062245006400069260001700133082001700150300000800167546002400175  aSharma/J.N/ Singh/Kehar   aDifferential equations  a2  f20  aPartial differential equations for engineers and scientists  bNarosac2009  a515.625bSHA  a339  aENGLISHcproduction