https://www.frontier-economics.com/media/5550/a-wholesale-gas-price-cap-in-europe.pdf
https://geoii.eu/start
http://countryeconomy.com/ratings
https://www.imf.org/en/News/Articles/2024/03/27/germanys-real-challenges-are-aging-underinvestment-and-too-much-red-tape