Perhaps you should try some spelling variations:
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"mali operations research : july 2006" » "taxi operations research : july 2006", "basic operations research : july 2006", "sales operations research : july 2006", "mali operations research : july 2008", "mali operations research : july 2007", "mali operations research : july 2009"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("making locations research : july 2019") OR ("mali operations research : july 2006"))~.
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• Adding a wildcard symbol may retrieve word variants: (("making locations research : july 2019") or ("mali operations research : july 2006"))*.