Huang, Zhong-Wen, et al. “Synthesis and Structure of Two Supramolecular Compounds Based on Macrocyclic Nickel(II) Complex and [Mo8O26]4-”. Asian Journal of Chemistry, vol. 27, no. 7, Mar. 2015, pp. 2579-82, doi:10.14233/ajchem.2015.18347.