
https://www.lawfareblog.com/how-hard-it-overturn-american-election?utm_campaign=Brookings%20Brief&utm_medium=email&utm_content=99533374&utm_source=hs_email

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

https://theconversation.com/investidura-o-bloqueo-y-vuelta-a-las-urnas-a-que-se-va-a-enfrentar-espana-210241