A. Troupis, T. M. Triantis, E. Gkika, A. Hiski and E, Papaconstantinou, “Photocatalytic reductive–oxidative degradation of Acid Orange7 by polyoxometalates,” Ap- plied Catalysis B: Environmental, Athens, Vol. 86, No.1-2, 2009, pp. 98-107.
 Y. Yang, Q. Y. Wu, Y. H. Guo, C. W. Hu and E. B. Wang, “Efficient degradation of dye pollutants on nanoporous polyoxotungstate–anatase composite under visible-light irradiation,” Journal of Molecular Catalysis A: Chemical, Vol. 225, No. 2, 2005, pp. 203-212.
 I. M. Arabatzis, S. Antonaraki, T. Stergiopoulos, A. Hiskia, E. Papaconstantinou, M. C. Bernard and P. Falaras, “Preparation, characterization and photocatalytic activity of nanocrystalline thin ?lm TiO2 catalyststowards 3, 5-dichlorophenol degradation,” Journal of Photochemistry and Photobiology A: Chemistry, Vol. 149, No. 1-3, 2002, pp. 237-245.
 E. Gkika, A. Troupis, A. Hiskia and E. Papaconstantinou, “Photocatalytic reduction of chromium and oxidation of organics by polyoxometalates,” Applied Catalysis B: En vironmental, Vol. 62, No 1-2, 2006, pp. 28-34.
 M. Yoon, J. A. Chang, Y. Kim, and J. R. Choi, “Heteropoly acid-incorported TiO2 collids as novel photocatalytic systems resembling the photo-synthetic reaction center,” Journal of Physical Chemistry B, Vol. 105, No. 13, 2001, pp. 2539-2545.
 C. Trolliet, G. Coudurier and J. C. Vedrine, “In?uence of the nature and porosity of different supports on the acidic and catalytic properties of H3PW12O40,” Topics in Catalysis, Vol. 15, No. 1, 2001, pp. 73-81.
 A. Mylonas, A. Hiskia and E. Papaconstantinou, “Contribution to water purification using polyoxometalates aromatic derivatives, chloroacetic acids”. Journal of Molecular Catalysis A: Chemical, Vol. 114, No.1-3, 1996, pp. 191-200.
 A. Mylonas, E. Papaconstantinou and V. Roussis, “Photocatalytic degradation of phenol and p-cresol by polyoxotungstates mechanistic implications,” Polyhedron, Vol. 15, No. 19, 1996, pp. 3211-3217.
 Y. Yang, Y. H. Guo, C. W. Hu and E. B Wang, “Lacunary Keggin-type polyoxometalates-based macroporous composite ?lms: preparation and photocatalytic activity,” Applied Catalysis A: General, Vol. 252, No. 2, 2003, pp 305-314.