https://www.ifw-kiel.de/fileadmin/Dateiverwaltung/IfW-Publications/-ifw/Kiel_Working_Paper/2022/KWP_2218_Which_countries_help_Ukraine_and_how_/KWP_2218_Trebesch_et_al_Ukraine_Support_Tracker.pdf
https://theconversation.com/antes-de-humboldt-y-darwin-estuvo-jose-de-acosta-234407
https://www.lobbycontrol.de/wp-content/uploads/LobbyControl-Jahresbericht_20-21-210630-web2.pdf