Krabs, W. <br/><br/>
Optimization and approximation 

 - New York  John-Wiley  1979 
 - xii, 220p., 22 cm. 
<br/><br/><label>ISBN: </label>0471997412 
<br/><br/><label>Dewey Class. No.: </label>515,  / DD, Kra