Cimen, Efdal, et al. “Preparation, Characterization and Crystal Structure of Dinuclear zinc(II) Carboxylate Complex With 1-(pyridin-4-yl)ethanone and 4-Methylbenzoate Based Ligands”. European Journal of Chemistry, vol. 7, no. 4, Dec. 2016, pp. 448-53, doi:10.5155/eurjchem.7.4.448-453.1509.