Ding, Y.J., and C.X. Zhao. “Solvothermal Synthesis and Crystal Structure of Cobalt(II) Complex Derived from 4-Heterocyclic Acylpyrazolone”. Asian Journal of Chemistry, vol. 26, no. 10, May 2014, pp. 3036-8, doi:10.14233/ajchem.2014.16589.