M. H. . Manulla and A. K. . Abbas, “La(III) and Ce(IV)Complexes of Novel Azo-Theophylline Ligand :Structural Analysis and Biological Effectiveness”, Iraqi Journal of Science, vol. 66, no. 1, pp. 39–51, Jan. 2025, doi: 10.24996/ijs.2025.66.1.4.