M. SHEIKHSHOAIE, V. SAHEB, and T. SHAMSPUR, “Density Functional Theory (DFT) with Combined Investigation of the Selectivity of a Symmetrical Tetradentate N2O2-Coordination Schiff Base Ligand for Mn(II) Ion in the Presence of Mixing Mg(II), Mn(II), Ba(II), Ca(II) and Ni(II) Ions”, Walailak J Sci & Tech, vol. 11, no. 6, pp. 517–523, Jan. 2014.