AMMONIUM OXALATE EXTRACTION OF IRON TRIAD FROM NATURAL CLAY SAMPLES. Works of the Faculty of Agriculture and Food Sciences University of Sarajevo, Sarajevo, Bosnia and Herzegovina, v. 74, n. 2, p. 78–86, 2026. DOI: 10.67407/rppf.2024.2.78. Disponível em: https://radovi.ppf.unsa.ba/index.php/rppf/article/view/45. Acesso em: 23 sep. 2026.