L.-M. Duan, J.-Q. Xu, F.-T. Xie, X.-B. Cui, H. Ding, J.-F. Song, “Synthesis and characterization of a new compound based on mixed Mo/V polyoxometalates connected and modified by [Ni(en)<sub>2</sub>]<sup>2+</sup> groups”, Mendeleev Commun., 15:2 (2005), 79–80
