00332nam a2200121Ia 4500082001900000100002000019245007100039260002500110300002300135490004200158500000500200700000500205  a530.1bB541.ST  aBerthier, A. M.  aSpectral theory and wave operators for the schrodinger equationsb  aBostonbPitmanc1982  a306p. Index, Bibl.  aResearch notes in Mathematicsv v. 71  a  a