@article{DE_1989_25_10_a7,
     author = {A. I. Panasyuk},
     title = {Approximation subsystems of a dynamical system of shifts},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1705--1715},
     publisher = {mathdoc},
     volume = {25},
     number = {10},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_10_a7/}
}