1. S. Krupicka, P. Novak, Oxide spinels, in Ferromagnetic Materials: A Handbook on the Properties of Magnetically Ordered Substances, vol. 3, ed. by E.P. Wohlfarth (North-Holland, Amsterdam, 1982), pp. 189–304
2. M. Neel, Ann. Phys. 12(3), 137 (1948)
3. H.A. Kramers, Physica. 1, 182 (1934)
4. P.W. Anderson, Sol. Stat. Phy. 14, 99 (1963)
5. J.H. Van Vleck, J. Phys. Radium 12, 262 (1951)