Geodesic
Hidden symmetry of free fermion model. II.~Partition function
Teoretičeskaâ i matematičeskaâ fizika, Tome 63 (1985) no. 2, pp. 291-302

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It is shown that the partition function of the free fermion model on a plane lattice has a certain hidden symmetry. By means of a special elliptical parametrization for the Boltzmann vertex weights, the partition function corresponding to one lattice site (lattice-site partition function) is calculated and shown to be a meromorphic function of three complex variables. 
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     author = {V. V. Bazhanov and Yu. G. Stroganov},
     title = {Hidden symmetry of free fermion model. {II.~Partition} function},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {291--302},
     publisher = {mathdoc},
     volume = {63},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1985_63_2_a11/}
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V. V. Bazhanov; Yu. G. Stroganov. Hidden symmetry of free fermion model. II.~Partition function. Teoretičeskaâ i matematičeskaâ fizika, Tome 63 (1985) no. 2, pp. 291-302. http://geodesic.mathdoc.fr/item/TMF_1985_63_2_a11/