00376nam a2200145Ia 4500020001800000082002000018100002000038245005100058250000800109260003700117300002800154490003800182500000500220700000500225  a9788181281838  a515.35bP449.DE  aPerko, Lawrence  aDifferential equations and dynamical systemsb  a3rd  aNew York bSpringer-Verlagc2014  axiv, 555p. Bibl. Index.  aTexts in Applied Mathematics v 7  a  a