1. Pauling, L.: Chem. Rev.
5, 173 (1928).
2. Finkelstein, B. N. and Horowitz, G. E.: Z. Physik
48, 118 (1928).
3. Guillemin, V. and Zener, C.: Proc. Natl. Acad. Sci. U.S.
15, 314 (1929).
4. The ‘atomic’ contributions are obtained by integration over the volume Va; the ‘bond’ contributions are obtained by integration over the volume V
b
. Here the bond region, V
b
is defined as the volume lying between the two hyperboloids rA—rB=0.4 R, and rB—rA=0.4 R. The region V
a
, which is the remainder of space, consists of two parts, each containing one of the two nuclei.
5. Feinberg, M. J., Ruedenberg, K., and Mehler, E. L.: in P. O. Löwdin (ed.), Advances in Quantum Chemistry, Academic Press, New York, 1970, Vol. 5, p. 28.