TY  - JOUR
TI  - [unknown]
JO  - Acta mathematica Universitatis Comenianae
PY  - 1983
SP  - 55
EP  - 64
VL  - 42-43
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AMUC_1983__42-43_185840/
ID  - AMUC_1983__42-43_185840
ER  -