Determination of Lead Levels in Soil for Some Areas at East Gezira And Khartoum - Sudan, Africa. Global Journal of Science Frontier Research, [S. l.], v. 19, n. B2, p. 27–32, 2019. Disponível em: https://testing.journalofscience.org/index.php/GJSFR/article/view/2485. Acesso em: 4 feb. 2026.