00295nam a22001097a 4500020001800000040000900018082001600027100002500043245003600068260004500104650003600149  a9788120336384  cNust  a515.35bBIS  aPurna Chandra Biswal  aOrdinary Differential Equations  aNew Delhi:bPHI Learning Pvt Ltd,c2008.  aOrdinary Differential Equations