
https://ec.europa.eu/commission/publications/position-paper-essential-principles-financial-settlement_en

https://committees.parliament.uk/publications/8781/documents/88926/default/

https://blogs.lse.ac.uk/brexit/2021/02/04/indyref2-scottish-independence-would-be-2-3-times-more-costly-than-that-of-brexit-and-rejoining-the-eu-wouldnt-make-up-the-difference/