International journal of production research
22
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| Fformat: | |
| Cyhoeddwyd: |
London : Institution of Production Engineers,
1961
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| Mynediad Ar-lein: | http://proquest.umi.com/pqdweb?RQT=318&TS=1109558440&clientId=21690&VType=PQD&VName=PQD&VInst=PROD&pmid=66251&PageNum=1 |