00269nam a2200109Ia 4500020001800000082001700018100002000035245003700055250001200092260002700104650002800131  a9788126531356  a530.15 KRE/A  aKreyszig, Erwin 0aAdvanced Engineering Mathematics  a9th ed.  bWileyaNew Delhic2016  aEngineering Mathematics