http://www.ips-journal.eu/regions/europe/article/show/battle-of-the-bulldogs-2063/
https://ec.europa.eu/commission/sites/beta-political/files/revised_withdrawal_agreement_including_protocol_on_ireland_and_nothern_ireland.pdf
http://blogs.lse.ac.uk/brexit/2017/08/22/what-does-respecting-the-referendum-result-mean/
https://onlinelibrary.wiley.com/doi/epdf/10.1111/jcms.13386