TY  - JOUR
AU  - J.J. Schäffer
TI  - Linear Differential Equations and Functional Analysis. V.
JO  - Mathematische Annalen
PY  - 1960
SP  - 308
EP  - 321
VL  - 140
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1960__140_160782/
ID  - MAN_1960__140_160782
ER  -