@article{SIGMA_2010_6_a91,
     author = {Sergey Ya. Startsev},
     title = {On {Non-Point} {Invertible} {Transformations} of {Difference} and {Differential-Difference} {Equations}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2010},
     volume = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2010_6_a91/}
}