TY  - JOUR
AU  - J. Schäffer
TI  - Another characterization of Hilbert spaces
JO  - Studia Mathematica
PY  - 1964
SP  - 271
EP  - 276
VL  - 25
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm-25-3-271-276/
DO  - 10.4064/sm-25-3-271-276
LA  - en
ID  - 10_4064_sm_25_3_271_276
ER  -