Rajendran, G., and C.S. Amritha. “Synthesis and Characterization of Thorium(IV) Complexes With Salicylaldehyde N(4)-Phenylthiosemicarbazone”. Asian Journal of Chemistry, vol. 18, no. 4, Mar. 2010, pp. 2695-9, https://asianpubs.org/index.php/ajchem/article/view/20639.