TY  - JOUR
TI  - [unknown]
JO  - Acta mathematica Universitatis Comenianae
PY  - 1984
SP  - 215
EP  - 220
VL  - 44-45
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AMUC_1984__44-45_185890/
ID  - AMUC_1984__44-45_185890
ER  -