TY  - JOUR
AU  - Kijonka, Václav
TI  - On relations between $f$-density and $(R)$-density
JO  - Communications in Mathematics
PY  - 2007
SP  - 15
EP  - 20
VL  - 15
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/COMIM_2007__15_1_a2/
LA  - en
ID  - COMIM_2007__15_1_a2
ER  -