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NUCLEAR PHYSICS B
Volume 636, Issue 3, Pages 611-631Publisher
ELSEVIER
DOI: 10.1016/S0550-3213(02)00409-1
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We investigate proposals of how the form factor approach to compute correlation functions at zero temperature can be extended to finite temperature. For the two-point correlation function we conclude that the suggestion to use the usual form factor expansion with the modification of introducing dressing functions of various kinds is only suitable for free theories. Dynamically interacting theories require a more severe change of the form factor program. (C) 2002 Elsevier Science B.V. All rights reserved.
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