Hussain, Imdad, et al. “Synthesis, Characterization and X-Ray Crystal Structure of Dizinc(II) Complex of Pseudo Calixarene Macrocycle Based on 2,2-Methylene-bis[(6-Formyl)-4-Tert-Butylphenol] and 1,3-Diamino-2-Propanol”. Asian Journal of Chemistry, vol. 27, no. 7, Mar. 2015, pp. 2630-4, doi:10.14233/ajchem.2015.18658.