“New Tetra-dentate Schiff Base Ligand N2O2 and Its Complexes with Some of Metal Ions: Preparation, Identification, and Studying Their Enzymatic and Biological Activities”, Baghdad Sci.J, vol. 19, no. 1, p. 0155, Feb. 2022, doi: 10.21123/bsj.2022.19.1.0155.