Geodesic
Temperature Correlation Function in the Absolutely Anisotropic XXZ Heisenberg Magnet
Teoretičeskaâ i matematičeskaâ fizika, Tome 131 (2002) no. 2, pp. 288-303

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For the one-dimensional $XXZ$ Heisenberg chain of spin $1/2$ at $\Delta =-\infty$ we calculate the two-time temperature correlation function of the third components of local spins. For the correlation function in the thermodynamic limit, we obtain the expression in terms of Fredholm determinants for linear integral operators. 
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     author = {N. I. Abarenkova and A. G. Pronko},
     title = {Temperature {Correlation} {Function} in the {Absolutely} {Anisotropic} {XXZ} {Heisenberg} {Magnet}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {288--303},
     publisher = {mathdoc},
     volume = {131},
     number = {2},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2002_131_2_a9/}
}
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N. I. Abarenkova; A. G. Pronko. Temperature Correlation Function in the Absolutely Anisotropic XXZ Heisenberg Magnet. Teoretičeskaâ i matematičeskaâ fizika, Tome 131 (2002) no. 2, pp. 288-303. http://geodesic.mathdoc.fr/item/TMF_2002_131_2_a9/