K. Dawood, S., A. Hassen, I., & Y. Yousif, T. (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