TY  - JOUR
AU  - Grebík, Jan
TI  - Ultrafilter extensions of asymptotic density
JO  - Commentationes Mathematicae Universitatis Carolinae
PY  - 2019
SP  - 25
EP  - 37
VL  - 60
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.14712/1213-7243.2015.279/
DO  - 10.14712/1213-7243.2015.279
LA  - en
ID  - 10_14712_1213_7243_2015_279
ER  -