Geodesic
Hidden symmetry of free Fermion model I.~Triangle equation and symmetric parametrization
Teoretičeskaâ i matematičeskaâ fizika, Tome 62 (1985) no. 3, pp. 377-387

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The well-known eight-vertex model of free fermions on a plane lattice is considered. Using the triangle equation and the symmetry properties of the model, we construct an elliptic parametrization for the Boltzmann vertex weights. In this parametrization, the weights are meromorphie functions of three complex variables. 
@article{TMF_1985_62_3_a5,
     author = {V. V. Bazhanov and Yu. G. Stroganov},
     title = {Hidden symmetry of free {Fermion} model {I.~Triangle} equation and symmetric parametrization},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {377--387},
     publisher = {mathdoc},
     volume = {62},
     number = {3},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1985_62_3_a5/}
}
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V. V. Bazhanov; Yu. G. Stroganov. Hidden symmetry of free Fermion model I.~Triangle equation and symmetric parametrization. Teoretičeskaâ i matematičeskaâ fizika, Tome 62 (1985) no. 3, pp. 377-387. http://geodesic.mathdoc.fr/item/TMF_1985_62_3_a5/