@article{CMFD_2010_37_a0,
     author = {I. A. Kolesnikova},
     title = {Necessary and sufficient conditions for the existence of symmetry groups for systems of differential-difference equations with partial derivatives},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {5--15},
     publisher = {mathdoc},
     volume = {37},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2010_37_a0/}
}