Mooser-Pearson approach,

The description of bonding within these compounds has been treated by several different approaches that come to the same conclusion. The (8 — N) rule that is generahzed by Mooser and Pearson uses a covalent model with collective counting of electrons. The generahzed 8 — N rule can be easily defined for simple binary compounds of the general formula, as 8x electrons are required in order... 

In addition to the reinterpretation of Pauling s rules developed by Burdett and McLarnan (1984), there have been a number of other studies related to various aspects of these standard rules. Due to the substantial number of errors in classifying AB compounds in terms of ionic radius ratio (e.g., Phillips, 1970 Tossell, 1980b), there have been numerous attempts to create structure maps that have two atomic quantities as coordinates and that can provide a unique separation of the different structure types. Such atom quantities may be related primarily to size or energy or to some combination of the two. Some of the most important such approaches are those of Mooser and Pearson (1959), Phillips (1970), and Simons and Bloch (1973). 

It was Ioffe (1951) who first pointed out that the basic electronic properties of a solid are determined primarily by the character of the bonds between nearest neighbors rather than by the long-range order. The chemical bond approach enabled Welker (1952) to predict many of the semiconducting properties of the III—V compounds. Mooser and Pearson (1956, 1960) expanded the chemical approach to semiconductivity into a systematic survey of different compounds and crystal classes. Although in the case of crystals this approach has been replaced by band structure calculations, several properties common to large classes of amorphous semiconductors become plausible if one understands their chemical bonding. 

Duffy JA (1980) Trends in energy gaps of binary compounds an approach based upon electron transfer parameters from optical spectroscopy. J Phys C 13 2979-2990 Mooser E, Pearson WB (1959) On the crystal chemistry of normal valence compounds. Acta Cryst 12 1015-1022... 

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