https://www.lobbycontrol.de/wp-content/uploads/gaslobby-studie-lobbycontrol.pdf
https://dgap.org/de/forschung/publikationen/europa-braucht-eine-bessere-geooekonomische-strategie
https://www.openmarketsinstitute.org/publications/after-the-midterms-in-a-divided-nation-antimonopoly-is-key-to-a-lasting-majority