TY  - JOUR
AU  - Witold Bula
TI  - On continua having three types of open subsets
JO  - Colloquium Mathematicum
PY  - 1981
SP  - 221
EP  - 225
VL  - 45
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-45-2-221-225/
DO  - 10.4064/cm-45-2-221-225
LA  - en
ID  - 10_4064_cm_45_2_221_225
ER  -