Naik, S., and R.K. Patel. “Studies on Some Anionic Complexes of Cobalt(II), Nickel(II) and Copper(II): Part III”. Asian Journal of Chemistry, vol. 17, no. 4, June 2016, pp. 2081-4, https://asianpubs.org/index.php/ajchem/article/view/13959.