00376nam a22001337a 4500020001800000082001500018100001900033245007100052250001200123260003500135300002600170650002700196700001900223  a9780321747747  a515.35 NAG  aNagle, R. Kent  aFundamentals of differential equations and boundary value problems  a6th ed.  aNew YorkbAddison Wesleyc2012  axviii, 810p. :e27 cm  aDifferential equations  aR. Kent. Nagle