http://www.pism.pl/upload/files/PISM%20Strategic%20File%20no%201%20(89).pdf
https://pism.pl/webroot/upload/files/Biuletyn/PISM%20Bulletin%20no%20174%20(2091)%208%20November%20%202022.pdf
https://www.iseas.edu.sg/wp-content/uploads/2025/07/The-State-of-SEA-2023-Final-Digital-V4-09-Feb-2023.pdf
https://visegradinsight.eu/distant-liaisons-france-central-europe/