@article{AUCMP_2007_48_2_a4,
     author = {Fla\v{s}kov\'a, Jana},
     title = {A note on $\Cal J$-ultrafilters and $P$-points},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {43--48},
     year = {2007},
     volume = {48},
     number = {2},
     mrnumber = {2512901},
     zbl = {1163.03027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_2007_48_2_a4/}
}