00294nam a2200121Ia 4500082002000000100002000020245002600040260002500066300002900091490004200120500000500162700000500167  a515.72bC767.SO  aConway, John B.  aSubnormal operatorsb  aBostonbPitmanc1981  axvii, 476p. Index, Bibl.  aResearch notes in Mathematicsv v. 51  a  a