1. L. C. W. BAKER, in “Advances in the Chemistry of the Coordination Compounds,”edited by S. Kirschner (McMillan, New York, 1961) p. 604.
2. M. T. POPE, “Heteropoly and IsopolyOxometalates” (Springer Verlag, 1983).
3. M. T. POPE, and A. MÜLLER (EDS.), “Polyoxometalates: From Platonic Solids to Anti-Retroviral Activity” (Kluwer Ac. Pub., Netherlands, 1994).
4. Chemical Reviews, Special Issue January/February 1998, All Chapters.
5. P. GOMEZ-ROMERO, AND N. CASAN-PASTOR, J. Phys. Chem. 100 (1996) 12448.