Abdul Samath, S., and S.K. Ramalingam. “Β-Diketonate Ln3+ Chelates, Stereoisomerism and X-Ray Diffraction Studies of Facial Complexes Under Photochemical Condition ”. Asian Journal of Chemistry, vol. 5, no. 4, Mar. 2010, pp. 893-01, https://asianpubs.org/index.php/ajchem/article/view/24948.