
https://www.oecd-ilibrary.org/docserver/467cf791-en.pdf?expires=1687844142&id=id&accname=guest&checksum=E3DB362DEFB5526E94E4B65C66C86AFD

https://www.brookings.edu/blog/education-plus-development/2020/04/29/the-covid-19-cost-of-school-closures/

https://www.socialeurope.eu/wp-content/uploads/2017/08/Occ-Pap-13-PDF.pdf