UGWU, S.; EZE, C. Mapping Bedrock Topography using Electromagnetic Profiling. Journal of Applied Sciences and Environmental Management, [S. l.], v. 13, n. 4, 2010. DOI: 10.4314/jasem.v13i4.55403. Disponível em: https://www.ajol.info/index.php/jasem/article/view/55403. Acesso em: 20 sep. 2026.