@article{SIGMA_2021_17_a107,
     author = {Dmitry K. Demskoi},
     title = {The {Lattice} {Sine-Gordon} {Equation} as a {Superposition} {Formula} for an {NLS-Type} {System}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2021},
     volume = {17},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a107/}
}