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2. Magnetism and the Chemical Bond;Goodenough,1963
3. Superexchange interaction and symmetry properties of electron orbitals;Kanamori;J. Phys. Chem. Solids,1959
4. New approach to the theory of superexchange interactions;Anderson;Phys. Rev.,1959
5. Crystal structure and magnetic properties of substances with orbital degeneracy;Kugel;Sov. Phys. – JETP,1973