For starters, you may wish to look into the paper

P.V. Christiansen, Language policy in the European Union

http://www.esperanto-jongeren.nl/pdf/EuropeanUnion.pdf

and the book Language Planning and Policy in Europe

http://books.google.com/books?id=T2TnL9boqzoC

Thank you nnery much for your valuable answer. I' take advantage of the information you"ve introduced here for me.

Maybe you can find some informations in this book: http://www.multilingual-matters.com/display.asp?isb=9781847698346

And more speficically in this article: http://www10.gencat.net/eapc_rld/revistes/revista.2008-09-19.4142560040/article.2008-10-17.3971385784/en

Thanks a lot for a very prompt answer, Albert Bastardas Boada. When I study your suggested book and article, obviuosly I'll let you know how helpful they have appeared to me.

There is a new project (a consortium of several European universities) which is very much related to what you are asking. Scholars engaged in this project are from different fields such law, linguistics, economists, geographers etc.

You should check this out: http://www.mime-project.org/.