http://www.realclearworld.com/articles/2017/04/17/a_us-uk_trade_agreement_and_the_trump_re-election_campaign_112297.html
https://www.politico.eu/article/spain-election-outcome-explained-pedro-sanchez-alberto-nunez-feijoo-socialist-popular-party-vox/
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1710en.pdf