P.C. Kwok, T.D. Schultz
Physical Review B
A one-sentence nonalgebraic evaluation of averages, such as occur in the theory of the Debye-Waller factor, is given, which is valid for certain types of anharmonic modes and also for ensembles more general than the canonical ensemble.
P.C. Kwok, T.D. Schultz
Physical Review B
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Solid State Communications
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