TY  - JOUR
TI  - [unknown]
JO  - Acta mathematica Universitatis Comenianae
PY  - 1985
SP  - 41
EP  - 48
VL  - 46-47
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AMUC_1985__46-47_185926/
ID  - AMUC_1985__46-47_185926
ER  -