Duckworth, W. E. <br/><br/>
A guide to operational research / 
W. E. Duckworth, A. E Gear, A. G. Lockett 
 - 3rd ed. 
 - London :  Chapman and hall,  c1977 
 - ix, 205 p. :  ill. ;  21 cm. 
<br/><br/> Includes index 
<br/><br/>Includes bibliographies 
<br/><br/><label>ISBN: </label>0412135000 (pbk) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Operations research
<br/><br/><label>Dewey Class. No.: </label>658.40301  / DUG 1977