Zhang, Yu-Jie, et al. “Synthesis, Crystal and Supramolecular Structure of {2,2’-[Ethylenedioxybis(nitrilomethylidyne)]dinaphthanolato}Cu(II)”. Asian Journal of Chemistry, vol. 26, no. 9, Apr. 2014, pp. 2664-6, doi:10.14233/ajchem.2014.15793.