@article{TRSPY_1975_138_a2,
     author = {V. V. Arestov},
     title = {Approximation of operators that are invariant under a~shift},
     journal = {Informatics and Automation},
     pages = {43--70},
     publisher = {mathdoc},
     volume = {138},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1975_138_a2/}
}