ANYANWU, E.; ONYELE, O. Occurrence and Concentration of Heavy Metals in a Rural Spring in South-eastern Nigeria. Journal of Applied Sciences and Environmental Management, [S. l.], v. 22, n. 9, p. 1473–1478, 2018. DOI: 10.4314/jasem.v22i9.19. Disponível em: https://www.ajol.info/index.php/jasem/article/view/179725. Acesso em: 6 nov. 2026.