TY  - JOUR
TI  - [unknown]
JO  - Acta Facultatis Rerum Naturalium Universitatis Comenianae
PY  - 1979
SP  - 7
EP  - 228
VL  - 34
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AFRNUC_1979__34_185780/
ID  - AFRNUC_1979__34_185780
ER  -