The Feasibility of using Natural Rocks as Sources of Iron, Manganese and Copper in Livestock Feeding in Ethiopia. Global Journal of Science Frontier Research, [S. l.], v. 15, n. D5, p. 7–12, 2015. Disponível em: https://www.journalofscience.org/index.php/GJSFR/article/view/1511. Acesso em: 13 aug. 2026.