ABDALLAH, Ahmed. The use of exploratory tunnels as a tool for scheduling and cost estimation. Technological and Economic Development of Economy, [S. l.], v. 13, n. 4, p. 280–287, 2007. DOI: 10.3846/13928619.2007.9637813. Disponível em: https://journals.vilniustech.lt/index.php/TEDE/article/view/7746. Acesso em: 15 may. 2025.