KERKÁPOLY, E. UNTERSUCHUNG DES OBERBAUSYSTEMS DER UNTERGRUNDBAHN IN BUDAPEST. Periodica Polytechnica Civil Engineering, [S. l.], v. 15, n. 2-3, p. 67–90, 1971. Disponível em: https://pp.bme.hu/ci/article/view/4304. Acesso em: 19 may. 2024.