Micro-Tunneling Challenges inRocky LandsContains HugeBoulders. International Journal of Advance Engineering and Research Development (IJAERD), [S. l.], v. 7, n. 10, p. 23–30, 2020. Disponível em: https://ijaerd.org/index.php/IJAERD/article/view/4746. Acesso em: 31 oct. 2025.