Tritan — Or, Recycled Failure
Even when direct methods fail to give a clear solution, E maps from some of the phase sets obtained contain correctly oriented fragments. Actually a number of workers have made use of structural information in the application of direct methods — for example, Hauptman (1964), Oda, Naya and Nitta (1967), Kroon and Krabbendam (1970) and Theissen and Busing (1974). The most systematic approach has been that of Main (1976) who has shown that knowledge of a correctly oriented structural fragment modifies the Cochran distribution for a three-phase invariant.
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