00554nam a2200181Ia 4500082002000000100002400020245006600044260004200110300001900152490003900171500000500210690000600215700000500221952010200226964001700328921001000345999001700355  a515.35bG874.SP  aGroen, P. P. N. De.  aSingularly perturbed differential operators of second orderb  aAmsterdambMathematisch Centrumc1976  aix, 159p. Ref.  aMathematical centre tractsv v. 68  a  a   a  00104070aISIbISId1998-09-24l0o515.35 G874.SPpDP18871r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a13613  c13613d13613