
https://www.open-britain.co.uk/new_research_trade_deals_with_five_key_countries_could_take_26_years_to_negotiate

https://theconversation.com/los-cuatro-desafios-de-una-legislatura-altamente-inflamable-en-espana-217758

http://wp.unil.ch/space/files/2016/05/SPACE-I-2014-Report_final.1.pdf