@article{CMUC_2004__45_4_a15,
     author = {Yoshioka, Iwao},
     title = {On spaces with point-countable $k$-systems},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {749--765},
     publisher = {mathdoc},
     volume = {45},
     number = {4},
     year = {2004},
     mrnumber = {2103090},
     zbl = {1099.54025},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2004__45_4_a15/}
}