Paul, Mathew, P. Venugopalan, and K. Krishnankutty. 2010. “Metal Chelates of 5-Aryl-1-Phenyl-4-Pentene-1,3-Diones ”. Asian Journal of Chemistry 14 (3):1335-40. https://asianpubs.org/index.php/ajchem/article/view/22404.