%0 Journal Article %A V. S. Ryaben'kii %T Necessary and sufficient conditions for good definition of boundary value problems for systems of ordinary difference equations %J Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki %D 1964 %P 242-255 %V 4 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZVMMF_1964_4_2_a3/ %G ru %F ZVMMF_1964_4_2_a3