@article{IVM_1959_4_a9,
     author = {G. Ya. Karasik},
     title = {Conditions for the existence of a~periodic solution of finite-difference equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {70--79},
     publisher = {mathdoc},
     number = {4},
     year = {1959},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1959_4_a9/}
}