K. AL-nama AL-nama and E. AL Nidaa AL Nidaa, “Preparation and Characterization of Co(II), Ni(II),Cu(II) and Zn(II) Complexes with Unsymmetrical Tetradentate Schiff Bases Ligands”, EDUSJ, vol. 28, no. 2, pp. 233–248, Jun. 2019.