1. J. W. Linnett. The Electronic Structure of Molecules. A New Approach. Methuen, London (1964).
2. A. R. Miedema, P. F. de Chatel, F. R. de Boer. Cohesion in alloys: Fundamentals of a semi-empirical theory. Physica
100B, 1 (1980).
3. R. G. Pearson. Chemical Hardness. Wiley-VCH, Weinheim (1997).
4. O. Johnson. An interstitial-electron model for the structure of metals and alloys I-VI. Bull. Chem. Soc. Japan
45, 1599, 1607 (1972); 46, 1919, 1923, 1929, 1935 (1973).
5. R. G. Wooley. Must a molecule have shape? J. Am. Chem. Soc. 100, 1073 (1978).