Journal of the Operational Research Society
22
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London : Operational Research Society,
1950
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| Online Access: | http://proquest.umi.com/pqdweb?RQT=318&TS=1110768897&clientId=21690&VType=PQD&VName=PQD&VInst=PROD&pmid=12717&PageNum=1 http://www.jstor.org/action/showPublication?journalCode=joperresesoci |