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@article{MAN_1968__177_161702, author = {J.J. Sch\"affer}, title = {A {Note} on {Systems} of {Linear} {Difference} {Equations.}}, journal = {Mathematische Annalen}, pages = {23--30}, publisher = {mathdoc}, volume = {177}, year = {1968}, zbl = {0159.12701}, url = {http://geodesic.mathdoc.fr/item/MAN_1968__177_161702/} }
J.J. Schäffer. A Note on Systems of Linear Difference Equations.. Mathematische Annalen, Tome 177 (1968), pp. 23-30. http://geodesic.mathdoc.fr/item/MAN_1968__177_161702/