@article{DE_1965_1_7_a7,
     author = {A. I. Klimushev},
     title = {Ljapunov functions for linear systems of difference equations with variable coeffiecients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {929--932},
     publisher = {mathdoc},
     volume = {1},
     number = {7},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_7_a7/}
}