https://www.eca.europa.eu/Lists/ECADocuments/Briefing_paper_MFF/Briefing_paper_MFF_EN.pdf
https://library.fes.de/pdf-files/wiso/14700.pdf
https://cdn.obr.uk/March-2020_EFO_presentation_slides.pdf
https://www.google.com/url?esrc=s&q=&rct=j&sa=U&url=https://www.imf.org/-/media/Files/Publications/WP/2022/English/wpiea2022187-print-pdf.ashx&ved=2ahUKEwiDqLXjvqP9AhXwiP0HHSdXC0UQFnoECAQQAg&usg=AOvVaw3YLIKX-UVfKoiGtiG_7NjZ