OKALIWE, E. F. Comparative Assessment of the Concentration of Heavy Metals in Concrete and Earthen Fish Ponds in South – East, Nigeria. The International Journal of Science & Technoledge, [S. l.], v. 5, n. 5, 2017. Disponível em: http://internationaljournalcorner.com/index.php/theijst/article/view/123542. Acesso em: 7 jul. 2024.