00570nam a2200181Ia 4500082002000000100003600020245004900056260003400105300002800139490003500167500000500202690000600207700002900213952010200242964001700344921001000361999001700371  a515.72bEd24.ST  aEdmunds, D. E. and Evans, W. D.  aSpectral theory and differential operatorsb  aOxfordbClarendon Pressc1989  axvi, 574p. Index, Bibl.  aOxford Mathematical monographs  a  a   aEvans, W. D. ; jt. auth.  00104070aISIbISId1998-09-21l0o515.72 Ed24.STpDP21406r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a12354  c12354d12354