Spatial Distribution of the Heavy Metals: Ni, Fe, Cr, and Mn in Roadside Soils of Maiduguri Metropolis, Borno State Nigeria. Global Journal of Science Frontier Research, [S. l.], v. 14, n. H1, p. 1–5, 2014. Disponível em: https://www.journalofscience.org/index.php/GJSFR/article/view/1275. Acesso em: 14 aug. 2026.