G. Potdar, Shashank, and P.R. Rajput. “PH-Metric Study of Metal-Ligand Stability Constants of Cu(II) and Fe(III) Complexes With Substituted Pyrazole and Isoxazole”. Asian Journal of Chemistry, vol. 18, no. 4, Mar. 2010, pp. 3160-2, https://asianpubs.org/index.php/ajchem/article/view/20779.