00347nam a2200109Ia 4500008004100000082002000041100001800061245004300079260003500122300002800157490005200185250307b        |||||||| |||| 00| 0 eng d  a515.72bD752.ST  aDowson, H. R.  aSpectral theory of linear operatorsb/  aLondon:bAcademic Press,c1978  axii, 422p. Bibl. Index.  aLondon Mathematical Society monographsv no. 12