Ludyk, Gunter, <br/><br/>
Time-variant discrete-time systems / 
Gunter Ludyk. 
 - Braunschweig :  Vieweg,  1981. 
 - 127 p. ; 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>3528084960 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Discrete-time systems.
<br/><br/><label>Universal Decimal Class. No.: </label>519.71  / LUD