@article{CMUC_1977__18_1_a10,
     author = {Luke\v{s}, Jaroslav and Zaj{\'\i}\v{c}ek, Lud\v{e}k},
     title = {The insertion of $G_\delta$ sets and fine topologies},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {101--104},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1977},
     mrnumber = {0447497},
     zbl = {0355.26003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1977__18_1_a10/}
}