1. N. Cohen and S. W.Benson, The Chemistry of Alkanes and Cycloakanes, ed. S. Patai and Z. Rappoport, Wiley, New York, 1992
2. Estimation of heats of formation of organic compounds by additivity methods
3. T. A. Albright , J. K.Burdett and M.Whangbo, Orbital Interactions in Chemistry, Wiley & Sons, New York, 1985
4. Localized Atomic and Molecular Orbitals