https://www.bakerinstitute.org/media/files/files/ac785a2b/BI-Brief-071817-CES_Russia1.pdf
https://ecipe.org/wp-content/uploads/2024/02/ECI_OccasionalPaper_02-2024_LY02.pdf
https://economiesuisse.ch/sites/default/files/publications/swisscode_e_web_0.pdf
https://www.nber.org/system/files/working_papers/w30028/w30028.pdf