Shakuntla Maurya, M.S., et al. “Thermodynamic Behaviour of Hypersensitive Transitions Observed in Some Pr(III) and Nd(III) Systems ”. Asian Journal of Chemistry, vol. 7, no. 3, Mar. 2010, pp. 523-6, https://asianpubs.org/index.php/ajchem/article/view/24352.