Geodesic
Lattice completely integrable regularization of the sine-Gordon model for small coupling constants
Teoretičeskaâ i matematičeskaâ fizika, Tome 59 (1984) no. 2, pp. 183-199

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The structure of the vacuum state and the spectrum of single-particle excitations are investigated in the quantum lattice sine-Gordon model, which is a regularized version of the corresponding quantum-field model. The region of coupling constants $0\gamma\pi/2$ is considered. 
@article{TMF_1984_59_2_a1,
     author = {N. M. Bogolyubov and A. G. Izergin},
     title = {Lattice completely integrable regularization of the {sine-Gordon} model for small coupling constants},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {183--199},
     publisher = {mathdoc},
     volume = {59},
     number = {2},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1984_59_2_a1/}
}
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N. M. Bogolyubov; A. G. Izergin. Lattice completely integrable regularization of the sine-Gordon model for small coupling constants. Teoretičeskaâ i matematičeskaâ fizika, Tome 59 (1984) no. 2, pp. 183-199. http://geodesic.mathdoc.fr/item/TMF_1984_59_2_a1/