Explicit formulas for correlation functions of ground states of the 1 dimensional XY model
Annales de l'I.H.P. Physique théorique, Tome 45 (1986) no. 1, pp. 49-59. 
@article{AIHPA_1986__45_1_49_0,
     author = {Matsui, Taku},
     title = {Explicit formulas for correlation functions of ground states of the 1 dimensional {XY} model},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {49--59},
     publisher = {Gauthier-Villars},
     volume = {45},
     number = {1},
     year = {1986},
     mrnumber = {856448},
     zbl = {0595.60095},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1986__45_1_49_0/}
}
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Matsui, Taku. Explicit formulas for correlation functions of ground states of the 1 dimensional XY model. Annales de l'I.H.P. Physique théorique, Tome 45 (1986) no. 1, pp. 49-59. http://archive.numdam.org/item/AIHPA_1986__45_1_49_0/

[1] H. Araki, T. Matsui, Ground states of the XY model. Commun. Math. Phys., t. 101, 1985, p. 213. | MR | Zbl

[2] H. Araki, T. Matsui, On analyticity of correlation functions for ground states of the XY model. Lett. Math. Phys., t. 2, 1986, p. 87. | MR

[3] R. Douglas, Banach algebra Techniques in Operator Theory. Academic Press, New York, 1972. | MR | Zbl

[4] B. Mccoy, T. Wu, The two dimensional Ising model. Havard Univ. Press. Cambridge, Massachusetts, 1972.