www.cairn.info/revue-etudes-economiques-de-l-ocde-2005-14-page-45.htm
www.tunisair.com/publish/article.asp?id=92

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Note added at 2 hrs (2008-09-15 10:52:57 GMT)
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I forgot the accent: "rétroactivement"

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Note added at 1 day5 hrs (2008-09-16 14:36:24 GMT)
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Main Entry: a pos·te·ri·o·ri
Function: adjective
Etymology: Latin, literally, from the latter
1 : of or relating to the kind of reasoning that derives propositions from the observation of facts or that by generalizations from facts arrives at principles <a posteriori demonstration> -- contrasted with a priori
2 : of or relating to what cannot be known except from experience : proved by induction from facts obtained by observation or experiment <a posteriori truth>

Citation format for this entry:
"a posteriori." Webster's Third New International Dictionary, Unabridged. Merriam-Webster, 2002. http://unabridged.merriam-webster.com (16 Sep. 2008)
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Main Entry: 1ex post fac·to
Function: adjective
Etymology: Late Latin, from a thing done afterward
: done, made, or formulated after the fact and on the basis of current premises, conditions, or knowledge : disregarding the previous status or setting of the event or thing concerning which a conclusion is reached or at which action is directed : RETROSPECTIVE, RETROACTIVE <ex post facto punishment> <the general gave his ex post facto approval -- W.H.Upson> <ex post facto rationalizations of behavior -- Edward Sapir> <the results of scientific inquiry are always subject to ex post facto interpretation -- H.M.Magid>

Citation format for this entry:
"ex post facto." Webster's Third New International Dictionary, Unabridged. Merriam-Webster, 2002. http://unabridged.merriam-webster.com (16 Sep. 2008).
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Main Entry: 2ex post facto
Function: adverb
: after the fact : in a retrospective or retroactive manner <no lawmaker can alter the fact, ex post facto -- C.A.Beard>

Citation format for this entry:
"ex post facto." Webster's Third New International Dictionary, Unabridged. Merriam-Webster, 2002. http://unabridged.merriam-webster.com (16 Sep. 2008).