TY  - JOUR
AU  - Juan Jorge Schäffer
TI  - Linear Difference Equations: Closedness of Covariant Sequences.
JO  - Mathematische Annalen
PY  - 1970
SP  - 69
EP  - 76
VL  - 187
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1970__187_162005/
ID  - MAN_1970__187_162005
ER  -