TY  - JOUR
AU  - Paweł Krupski
TI  - Hyperspaces of universal curves
and $2$-cells are true $F_{\sigma \delta }$-sets
JO  - Colloquium Mathematicum
PY  - 2002
SP  - 91
EP  - 98
VL  - 91
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm91-1-7/
DO  - 10.4064/cm91-1-7
LA  - en
ID  - 10_4064_cm91_1_7
ER  -