@article{RM_1961_16_2_a19,
     author = {V. V. Grushin},
     title = {Isolated singularities of solutions of difference equations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1961},
     volume = {16},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1961_16_2_a19/}
}