Svraka, I., Memić, M., Sulejmanović, J., & Muhić-Šarac, T. (2014). Preconcentration of Metal Ions Using Silica Gel 60 F254. Bulletin of Chemists and Technologists of Bosnia and Herzegovina, 42, 11-16. https://glashem.pmf.unsa.ba/index.php/bctbh/article/view/120