Tender, Manuel L., Francisco F. Martins, João P. Couto, and Alfonso Cortés Pérez. 2017. “Study on Prevention Implementation in Tunnels Construction: Marão Tunnel’s (Portugal) Singularities”. Revista De La Construcción. Journal of Construction 16 (2):262-73. https://doi.org/10.7764/RDLC.16.2.262.