[3] Bai L., Lin B.Z., Houng X.F., Chen Z.J., Cao, X. G.,
Hydrothermal Synthesis, Crystal Structures and Electrochemical Properties of Two Phosphatotungstates Containing Keggin Clusters, [Cu(2,2′-bipy)2]5[PW12O40] · 2H2O and (Hpip)3[PW12O40]. J. Clust. Sci., 19: 561 (2008).
[17] Liu, K., Xu, Y., Yao, Z., Miras, H. N., Song, Y. F.,
Polyoxometalate-Intercalated Layered Double Hydroxides as Efficient and Recyclable Bifunctional Catalysts for Cascade Reactions, Chem. Cat. Chem., 8: 929 (2016).
[22] Limanski, E.M., Piepenbrink, M., Droste, E, Burgemeister K., Krebs B.,
Syntheses and X-ray Characterization of Novel [M4(H2O)2(XW9O34)2]n− (M=CuII, X=CuII; and M=FeIII, X=FeIII) Polyoxotungstates, J. Clust. Sci.,
13: 369 (2002).