UGBEDE, F.; MOKOBIA, C. Outdoor background gamma radiation levels in rural environments of Enugu east, Nigeria. Scientia Africana, [S. l.], v. 18, n. 2, p. 145–162, 2020. DOI: 10.4314/sa.v18i2. Disponível em: https://www.ajol.info/index.php/sa/article/view/199498. Acesso em: 27 sep. 2026.