Müller, Achim, et al. “Classical and Quantum Magnetism in Giant Keplerate Magnetic Molecules.”10.1002/1439-7641(20010917)2:8/9&#60;517::AID-CPHC517&#62;3.0.CO;2-1__ChemPhysChem, vol. 2, no. 8–9, Wiley, 2001, pp. 517–21, doi:10.1002/1439-7641(20010917)2:8/9&#60;517::AID-CPHC517&#62;3.0.CO;2-1.