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Source? Specifically, a source that can pinpoint a statement by a Libyan official in the immediate run-up to the intervention in Libya (i.e., late 2010 or early 2011) indicating a desire to switch to selling oil in euros.
The closest I've ever seen to such a source is that one of the cables released in the Wikileaks leak reported that a source close to Sarkozy outlined a few reasons why he wanted to intervene of Libya, one of which was a desire to replace the CFA franc (effectively backed by France) with a gold-based Libyan dinar.