V. Lokhande, Manohar. “Synthesis and Characterization of Lanthanide(III) Complexes With 2,4-Pyrimidine Diamine-5[(3,4,5-Trimethoxy Phenyl) Methyl]”. Asian Journal of Chemistry, vol. 18, no. 4, Mar. 2010, pp. 2662-8, https://asianpubs.org/index.php/ajchem/article/view/20634.