TY  - JOUR
AU  - Pták, Vlastimil
TI  - On the closed graph theorem
JO  - Czechoslovak Mathematical Journal
PY  - 1959
SP  - 523
EP  - 527
VL  - 9
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1959.100379/
DO  - 10.21136/CMJ.1959.100379
LA  - en
ID  - 10_21136_CMJ_1959_100379
ER  -