K. Dawood, Saad, Israa A. Hassen, and Thana Y. Yousif. 2006. “Synthesis and Characterization of Tetradentat Macrocyclic Ligands and Its Complexes With Mn(II),Fe(II),Co(II),Ni(II) and Cu(II) Metal Ions”. Journal of Education and Science (JES) 18 (2):1-10. https://doi.org/10.33899/edusj.2006.79265.