Wagner, C. F. <br/><br/>
Symmetrical components  as applied to the analysis of unbalanced electrical circuits 
by C. F. Wagner and R. D. Evans. 
 - New York  McGraw-Hill  1933 
 - xi, 437p. 
<br/><br/><label>Dewey Class. No.: </label>621.31913  / N33;1