Harikumaran Nair, M.L., and A.T. Mariamma. 2010. “Synthesis and Characterization of Thorium(IV) Complexes of 2,3-Dimethyl-1-Phenyl-4- (2-Hydroxy-5-Methyl Phenyl Azo)-Pyrazol-5-One”. Asian Journal of Chemistry 18 (4):2983-88. https://asianpubs.org/index.php/ajchem/article/view/20717.