Rai, H.C., et al. “Cobalt(II), Nickel(II) and Copper(II) Complexes With 3,8-Diphenyl, 4,7-Diaza-2, 9-Dihydroxyimino-5-Methyl-3,7-Decadiene”. Asian Journal of Chemistry, vol. 13, no. 1, Mar. 2010, pp. 269-76, https://asianpubs.org/index.php/ajchem/article/view/22563.