Knebusch, Manfred and Kolster, Manfred <br/><br/>
Wittrings 
Knebusch, Manfred and Kolster, Manfred 
 - Braunschweig:  Friedr. Vieweg & Sohn,  1982 
 - xi, 96 p.  24 cm. 
 - Aspects of mathematics  .2 .
<br/><br/><label>ISBN: </label>3528085126 
<br/><br/><label>Dewey Class. No.: </label>512.4 KNE