Arora, Rakhi, et al. “Synthesis and Structural Studies of Complexes of 4’-Methyl Acetophenone O-Hydroxy 4-Benzamido Thiosemicarbazone With Oxovanadium(IV), Cobalt(II), Nickel(II) and Copper(II)”. Asian Journal of Chemistry, vol. 16, no. 2, Aug. 2016, pp. 654-8, https://asianpubs.org/index.php/ajchem/article/view/14501.