
https://www.opendemocracy.net/democraciaabierta/cristina-flesher-fominaya-andrea-teti/espa%C3%B1a-el-holograma-como-protesta

https://wiiw.ac.at/achieving-geoeconomic-goals-by-boosting-the-economy-without-raising-the-public-debt-ratio-new-evidence-on-the-effects-of-public-investment-in-the-european-union-dlp-7398.pdf

http://www.britishelectionstudy.com/bes-findings/what-mattered-most-to-you-when-deciding-how-to-vote-in-the-eu-referendum/#.WWPVLnmQw2z