@article{MZM_2005_78_6_a13,
     author = {V. I. Buslaev and S. F. Buslaeva},
     title = {Poincare {Theorem} for {Difference} {Equations}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {943--947},
     publisher = {mathdoc},
     volume = {78},
     number = {6},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2005_78_6_a13/}
}