https://www.elysee.fr/emmanuel-macron/2019/03/04/pour-une-renaissance-europeenne
https://www.gmfus.org/download/article/19731
http://pubdocs.worldbank.org/en/244481520499464074/Growing-United-v03-online-18-03-08.pdf
http://www.economics-ejournal.org/economics/journalarticles/2017-4