1. S. Arnott, S.D. Dover, A.J. Wonacott, Acta Crystallogr., B 28 (1969) 2198, R. Fieldman in Atlas of Macromolecular Structure on Microfiche (AMSOM) , Document 13.2.1.1.1, National Institutes of Health, Bethesda, Washington (1986) .
2. G. Del Re, J. Ladik, G. Biczó, Phys. Rev. 155 (1967) 997; J. Ladik, Quantum Theory of Polymers as Solids, Plenum Press, New York, 1988.
3. L'Etude Théorique des Systèmes Périodiques. I. La MéthodeLCAOHCO
4. Note on an Approximation Treatment for Many-Electron Systems