Bonding and Charge Distribution in Polyoxometalates: A Bond Valence Approach - Allen J. Bard, Ian G. Dance, Peter Day, James A. Ibers, Toyohi Kunitake, Thomas J. Meyer, D. Michael P. Mingos, Herbert W. Roesky, Jean-Pierre Sauvage, Arndt Simon, . Fred Wudl ((Structure and Bonding))