W. Ibrahim, Mushal, مشاعل, Zuhoor F. Dawood, and زهور. 2008. “Preparation and Characterization of Cobalt (II)- Complexes of 4-Hydroxybenzaldehyde Semicarbazone and Amino Acid Esters Ligands”. Journal of Education and Science (JES) 21 (4):11-22. https://doi.org/10.33899/edusj.2008.56110.