Duckworth, Walter Eric <br/><br/>
A guide to operational research 
/ W.E. Duckworth 
 - 2nd ed. 
 - London  Methuen  1965 
 - 156 p. : ill. ; 22 cm. 
<br/><br/><label>ISBN: </label>0416687008 
<br/><br/><label>LCCN: </label>wl-n90-184240 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Operations research