Numan, A. .T., 		Sultan, K. .M., AND 		Abdullah, A.S..
" Complexeation Behavior of CoII, NiII, CuII, ZnII, and CdII Ions Toward Schiff Base Derived From 2, 4 -Dihydroxy Benzaldehyde and O-Phenylene Diamine" <em>Ibn AL- Haitham Journal For Pure and Applied Sciences</em> [Online], Volume 22 Number 3 (6 August 2017)