BARTÁK, J. . THE OLDEST UNDERGROUND RAILWAYS IN THE WORLD AND THEIR ANNIVERSARIES. Acta Polytechnica CTU Proceedings, [S. l.], v. 29, p. 1–5, 2021. DOI: 10.14311/APP.2020.29.0001. Disponível em: https://ojs.cvut.cz/ojs/index.php/APP/article/view/7030. Acesso em: 2 may. 2024.