Temperature correlation functions in the~XX0 Heisenberg chain.~I
Teoretičeskaâ i matematičeskaâ fizika, Tome 94 (1993) no. 1, pp. 19-51

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Space and time dependent correlation functions in the Heisenberg XX0 chain (in the transverse magnetic field) are expressed in terms of Fredholm determinants of linear integral operators. This is done in order to evaluate asymptotics of these correlations, which we shall do in next paper.
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F. Colomo; A. G. Izergin; V. E. Korepin; V. Tognetti. Temperature correlation functions in the~XX0 Heisenberg chain.~I. Teoretičeskaâ i matematičeskaâ fizika, Tome 94 (1993) no. 1, pp. 19-51. http://geodesic.mathdoc.fr/item/TMF_1993_94_1_a2/