Gelb,Arthur <br/><br/>
Multiple-Input Describing Functions and Nonlinear System Design 
/ by Arthur Gelb 
 - new york  Mcgraw-hill book company  1968 
 - 655p. 
<br/><br/><label>ISBN: </label>000 
<br/><br/><label>Dewey Class. No.: </label>629.836  / GEL/M