@article{CMUC_1972_13_3_a11,
     author = {Frol{\'\i}k, Zden\v{e}k},
     title = {Prime filters with {CIP}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {553--575},
     year = {1972},
     volume = {13},
     number = {3},
     mrnumber = {0315648},
     zbl = {0251.54001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1972_13_3_a11/}
}