Helszajn, J. <br/><br/>
Non-reciprocal microwave junctions and circulators   
by J. Helszajn 
 - New York  Wiley Interscience  1975 
 - vii, 349p. 
<br/><br/><label>ISBN: </label>0471369357 
<br/><br/><label>Dewey Class. No.: </label>621.381331  / N75