Bonsall, F.F. Duncan, J. <br/><br/>
Numberical ranges of operators on normed spaces and of elements of normed algebras 

 - New York  Cambridge at the University Press  1971 
 - 142 p. 
 - London Mathematical Society Lecture Note Series; No.2 .
<br/><br/> Includes bibliography, index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Normed Linear Spaces<br/>Linear operators<br/>Banach algebras
<br/><br/><label>Dewey Class. No.: </label>512.55  / BON