La(III) and Ce(IV)Complexes of Novel Azo-Theophylline Ligand :Structural Analysis and Biological Effectiveness. Iraqi Journal of Science [Internet]. 2025 Jan. 30 [cited 2025 Jul. 30];66(1):39-51. Available from: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/10813