Adiguzel, Ragip, et al. “Synthesis and Characterization of Novel Ni(II), Cu(II) and Cd(II) Complexes of 4-(2-Chlorphenylazo)-1H-Pyrazole-3,5-Diamine”. Asian Journal of Chemistry, vol. 23, no. 4, Dec. 2010, pp. 1846-50, https://asianpubs.org/index.php/ajchem/article/view/10270.