Huq, Fazlul. “Molecular Modelling Analysis of the Axial Distortion of the Coordination Geometry Around Copper(II) in Octahedral Ligand Fields”. Asian Journal of Chemistry, vol. 18, no. 3, Mar. 2010, pp. 1633-6, https://asianpubs.org/index.php/ajchem/article/view/20850.