00401nam a2200133Ia 4500082002000000100002200020245004100042260003600083300002900119490003900148500005100187500000500238700002400243  a515.72bW418.LO  aWeidmann, Joachim  aLinear operators in hilbert spacesb  aNew YorkbSpringer-Verlagc1980  axiii, 402p. Index, Bibl.  aGraduate texts in Mathematicsv 68  a"Tr. from the German edition by Joseph Szucs".  a  aSzucs, Joseph ; tr.