https://institute.global/news/tony-blair-parliaments-duty-brexit
https://publications.parliament.uk/pa/cm201719/cmselect/cmcumeds/365/36503.htm
http://fedtrust.co.uk/our-work-on-europe/there-may-be-trouble-ahead-brexit-after-the-election/
http://www.wsta.co.uk/images/Brexit/Brexit_FINAL.pdf