RESCUE SYSTEM FOR MANHOLE AND WELL. International Engineering Journal For Research & Development, [S. l.], v. 6, n. 3, p. 7, 2021. DOI: 10.17605/OSF.IO/GXZEA. Disponível em: https://iejrd.com/index.php/iejrd/article/view/1961. Acesso em: 8 oct. 2026.