TY  - JOUR
AU  - Bican, Ladislav
TI  - Pure closures
JO  - Czechoslovak Mathematical Journal
PY  - 1972
SP  - 78
EP  - 82
VL  - 22
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1972.101078/
DO  - 10.21136/CMJ.1972.101078
LA  - en
ID  - 10_21136_CMJ_1972_101078
ER  -