00301nam a22001097a 4500020001800000040000900018082001600027100002200043245006800065260003600133650002200169  a9780070200302  cNust  a515.35bFAR  aStanley J. Farlow  aAn introduction to differential equation and their application   aNew York:bMcGraw  Hill,c1994.  aApplied Calculus