AMMONIUM OXALATE EXTRACTION OF IRON TRIAD FROM NATURAL CLAY SAMPLES (J. Jurković, S. Haseljić, E. Sijahović, S. . Murtić, & A. Prkić , Trans.). (2026). Works of the Faculty of Agriculture and Food Sciences University of Sarajevo, 74(2), 78-86. https://doi.org/10.67407/rppf.2024.2.78