Classical and Quantum Magnetism in Giant Keplerate Magnetic Molecules
A. Müller, M. Luban, C. Schröder, R. Modler, P. Kögerler, M. Axenovich, J. Schnack, P. Canfield, S. Bud’ko, N. Harrison, ChemPhysChem 2 (2001) 517–521.