Herrero, Domingo A. <br/><br/>
Approximation of Hilbert space operators,.  vol. 1/ 
Domingo A. Herrero. 
 - Boston:  Pitman,  1982. 
 - xiii, 255 p. 
 - Pitman Research Notes in Mathematics Series;  72 .
<br/><br/><label>ISBN: </label>0273085794 
<br/><br/><label>Dewey Class. No.: </label>515.724   / H565a