@article{10_21136_CMJ_1968_100812,
     author = {Duda, Roman and Telg\'arsky, Rastislav},
     title = {On some covering properties of metric spaces},
     journal = {Czechoslovak Mathematical Journal},
     pages = {66--82},
     year = {1968},
     volume = {18},
     number = {1},
     doi = {10.21136/CMJ.1968.100812},
     mrnumber = {0227931},
     zbl = {0157.29504},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1968.100812/}
}