
https://ukandeu.ac.uk/wp-content/uploads/2022/03/UKICE-Divergence-Tracker-third-edition.pdf

https://www.iwh-halle.de/fileadmin/user_upload/publications/iwh_discussion_papers/iwh-discussion-paper_2019-04_Brautzsch_Holtemoeller.pdf

https://frictions.co/english/linsoutenable-legerete-du-labeur/working-ourselves-clean/