Gustafson, Karl E.  <br/><br/>
Numerical range : the field of values of linear operators and matrices 

 - New York  Springer  1997 
 - xiv, 189p. ; 23 cm. 
 - Universitext .
<br/><br/><label>ISBN: </label>038794835X  978-0-387-94835-5  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics ; Analysis 
<br/><br/><label>Dewey Class. No.: </label>515.7246  / GUS