https://www.bancaditalia.it/pubblicazioni/qef/2018-0422/QEF_422_18.pdf
https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:52022PC0457&from=EN
https://www.economie.gouv.fr/coronavirus-soutien-entreprises?xtor=ES-29-[BIE_Sp%C3%A9cialCoronavirus_20200303]-20200303-[https://www.economie.gouv.fr/coronavirus-soutien-entreprises]
https://www.economiesuisse.ch/de/artikel/hohe-loehne-tiefe-ungleichheit-und-ein-attraktiver-standort