Angelov, Trifon. “Original Rapid UV-Vis Spectrophotometric Quantification of Ferrous Bisglycinate in Food Supplements”. Proceedings of the Bulgarian Academy of Sciences 78, no. 6 (June 29, 2025): 821–829. Accessed November 2, 2026. https://proceedings.bas.bg/index.php/cr/article/view/777.