@article{CMUC_1992__33_1_a4,
     author = {Krassowska, Dorota and \'Sliwa, Wiesƚaw},
     title = {When $(E,\sigma (E,E'))$ is a $DF$-space?},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {43--44},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1992},
     mrnumber = {1173744},
     zbl = {0782.46006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1992__33_1_a4/}
}