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The Economou-Cohen criterion of localizations (1972) is examined in the light of the new averaging formalism of Mookerjee. It is found that clusters have no effect on it. The basic assumptions are examined and in view of these results, and those of Haydock and Mookerjee, serious doubt is cast on the validity of this criterion.
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Abhijit Mookerjee (1974) studied this question.
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