Singh, Ashok K., et al. “Synthesis, Characterization and Antimicrobial Evaluation of Cobalt(III) Complexes of 4-(2-Substituted Phenylimino)-2-(4-Substituted Phenyl)-4H-Chromen-3-Ol”. Asian Journal of Chemistry, vol. 31, no. 9, July 2019, pp. 2015-21, doi:10.14233/ajchem.2019.22068.