@article{CMUC_1967__8_4_a7,
     author = {Frol{\'\i}k, Zden\v{e}k},
     title = {Non-homogeneity of $\beta P-P$},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {705--709},
     publisher = {mathdoc},
     volume = {08},
     number = {4},
     year = {1967},
     mrnumber = {0266160},
     zbl = {0163.44601},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1967__8_4_a7/}
}