Terk, Erik, Tõnis Hunt, and Indrek Saar. “Future Shifts in the Competitiveness of Freight Transport: A Delphi Method-Based Study”. Estonian Discussions on Economic Policy 32, no. 1-2 (June 9, 2025): 192–214. Accessed December 5, 2025. https://ojs.utlib.ee/index.php/TPEP/article/view/25523.