00354nam a2200121Ia 4500082002000000100003800020245004700058260003600105300001500141490004000156500000500196700003100201  a515.72bC718.TG  aColojoara, Ion and Foias, Ciprian  aTheory of generalized spectral operatorsb  aNew YorkbGordon & Breachc1968  axvi, 232p.  aMathematics and applicationsv v. 9  a  aFoias, Ciprian ; jt. auth.