Agrawal, O.P., et al. “Synthesis, Characterization and Antimicrobial Activity of Thiomalates of Mn(II), Fe(II) and Co(II) ”. Asian Journal of Chemistry, vol. 2, no. 4, Mar. 2010, pp. 432-7, https://asianpubs.org/index.php/ajchem/article/view/25341.