TY  - JOUR
TI  - [unknown]
JO  - Acta mathematica Universitatis Comenianae
PY  - 1983
SP  - 197
EP  - 200
VL  - 42-43
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AMUC_1983__42-43_185855/
ID  - AMUC_1983__42-43_185855
ER  -