Zhang, Yu-Jie, et al. “Synthesis and Crystal Structure of Supramolecular Trinuclear Nickel(II) Complex With 5-Methoxy-4’-Chloro-2,2’-[ethylenedioxybis(nitrilomethylidyne)]diphenol”. Asian Journal of Chemistry, vol. 26, no. 4, Feb. 2014, pp. 1174-8, doi:10.14233/ajchem.2014.16162.