Ezhilarasi, J. Rosaline, et al. “Synthesis, Characterization and Antimicrobial Screening of Mn(II), Ni(II) and Cu(II) Complexes of 3,4,5-Trihydroxy Benzoic acid[1-(pyridyl)ethylidene]hydrazone”. Asian Journal of Chemistry, vol. 29, no. 12, Oct. 2017, pp. 2619-22, doi:10.14233/ajchem.2017.20730.