CHATIREE, N.S., and T.C. SHARMA. “Synthesis and Characterization of Complexes of Cobalt(II), Nickel(II) and Copper(II) With Substituted Pyrazoline”. Asian Journal of Chemistry, vol. 6, no. 2, June 2010, pp. 405-7, https://asianpubs.org/index.php/ajchem/article/view/24560.