1. Jørgensen, C. K.: Quantum Theory of Atoms, Molecules, Solid State, p. 307; ed. P. O. Löwdin. New York: Academic Press 1966.
2. —Struct. Bonding 1, 233 (1966).
3. —Chimia 23, 292 (1969); 25, 109 (1971).
4. —Modern Aspects of Ligand Field Theory. Amsterdam: North-Holland 1971.
5. Griffith, J. S.: The Theory of Transition Metal Ions. Cambridge: Univ. Press 1961.