00393nam a2200133 a 450000500170000002000150001708200210003210000160005324500530006926000510012230000180017349000530019170000150024420251203090445.0  a0582994551  a515.35,bDD, Par  aparis, R.B.  aAsymptotics of high order differential equations  aNew YorkbLongman Scientific & technicalc1986  a344p., 23 cm.  aPitman research notes in mathematics seriesd129  aWood, A.D.