HURSKY, J. The Prague underground, its present and future. Bollettino della Società Geografica Italiana, [S. l.], p. 37–43, 1986. DOI: 10.36253/bsgi-6431. Disponível em: https://www.bsgi.it/index.php/bsgi/article/view/6431. Acesso em: 15 oct. 2026.