Operational research'81 proceedings of the ninth IFORS International Conference on Operational Research, Hamburg, Germany, July 20-24, 1981 
edited by J.P. Brans. 
 - Amsterdam  North-Holland Publishing Company  1981. 
 - 984pages. ;  23 cm. 
<br/><br/> Summaries in English and French. 
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/><br/>engfre. 
<br/><br/><label>ISBN: </label>0444862234 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Management--Mathematical models--Congresses<br/>Operations research--Congresses<br/>System analysis--Congresses