https://wiiw.ac.at/regulatory-convergence-within-technical-barriers-to-trade-dlp-6630.pdf
https://www.lobbycontrol.de/wp-content/uploads/gaslobby-studie-lobbycontrol.pdf
https://www.trade.gov/sites/default/files/2023-04/PAC-DBIA%20Report_Apr%202023.pdf