%0 Journal Article %A L. D. Zamkobaya %T The central index for systems of linear difference equations %J Differencialʹnye uravneniâ %D 1977 %P 362-363 %V 13 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1977_13_2_a15/ %G ru %F DE_1977_13_2_a15