Dong, W.-K., L. Xu, X.-Y. Zhang, G. Li, X.-Y. Dong, and M.-M. Zhao. “Synthesis, Crystal and Supramolecular Structure of Nickel(II) Complex With Asymmetrical Salamo-Type Ligand”. Asian Journal of Chemistry, Vol. 25, no. 17, Nov. 2013, pp. 9981-4, https://asianpubs.org/index.php/ajchem/article/view/8450.