M. F. Ahmad Fadzil, M. K. Najah, N. Yen, S. N. Mohd Janib, and N. H. M. Khairullah, “Purification and concentration of gallium-68 via anion exchange method from a SnO2 -based column germanium-68/ gallium-68 generator”, jnrt, vol. 12, no. 01, pp. 1-18, Jun. 2015.