Arora, Kishor, et al. “Some Hexa-Coordinated Lanthanide(III) Iodide Complexes With Schiff Bases of Cyanoethylated Benzaldehyde”. Asian Journal of Chemistry, vol. 23, no. 2, Oct. 2010, pp. 515-8, https://asianpubs.org/index.php/ajchem/article/view/15855.