@article{SIGMA_2017_13_a52,
     author = {Andrei K. Pogrebkov},
     title = {Symmetries of the {Hirota} {Difference} {Equation}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2017},
     volume = {13},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2017_13_a52/}
}