https://www.bruegel.org/sites/default/files/2024-09/PB%2019%202024.pdf
https://www.ui.se/globalassets/ui.se-eng/publications/other-publications/the-limits-of-economic-coercion.pdf?utm_source=POLITICO.EU&utm_campaign=d3cc0cf4ef-EMAIL_CAMPAIGN_2021_12_02_09_59&utm_medium=email&utm_term=0_10959edeb5-d3cc0cf4ef-190380769
https://www.bertelsmann-stiftung.de/fileadmin/files/BSt/Publikationen/GrauePublikationen/20200325_PEPP_GrundII.pdf
https://www.publico.pt/2020/07/15/politica/opiniao/valores-nao-negoceiam-sao-objeto-compra-venda-1924561