https://www.socialeurope.eu/germanys-true-economic-disease
https://www.euronews.com/2018/09/26/after-three-decades-and-trillions-in-investment-east-germany-still-trails-west
https://wiiw.ac.at/the-energy-transition-in-the-western-balkans-the-status-quo-major-challenges-and-how-to-overcome-them-dlp-6896.pdf
https://www.bruegel.org/wp-content/uploads/2021/05/PC-2021-11-ecofin-210521.pdf