I. Svraka, M. Memić, J. Sulejmanović, and T. Muhić-Šarac, “Preconcentration of Metal Ions Using Silica Gel 60 F254”, Glas. hem. tehnol. Bosne Herceg., vol. 42, pp. 11–16, Jun. 2014, Accessed: Aug. 31, 2026. [Online]. Available: https://glashem.pmf.unsa.ba/index.php/bctbh/article/view/120