Keys, Paul., <br/><br/>
Operational research and systems  the systemic nature of operational research 
by Paul Keys. 
 - New York  Plenum Press  1991. 
 - 267 pages. :  illustrations. ;  23 cm. 
<br/><br/><label>ISBN: </label>0306436426  RM201.79 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Operations research.<br/>System analysis.