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From studies of the influence of polyhedron distortions on bond valence sums (BVS), it is concluded that larger deviations of the BVS values from corresponding values of their classical valence are due to the fact that so far no distinction has been made between the stoichiometric valence derived from chemical analysis and the structural valence derived from structure data.
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LIEBAU et al. (2005) studied this question.
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