TY  - JOUR
AU  - Levi, Sandro
TI  - Closed mappings are open at a $G_\delta $ set
JO  - Portugaliae mathematica
PY  - 1979
SP  - 7
EP  - 9
VL  - 38
IS  - 3-4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1979__38_3-4_115385/
LA  - en
ID  - PORMA_1979__38_3-4_115385
ER  -