@article{CMUC_1993__34_2_a17,
     author = {Kubiak, Tomasz},
     title = {A strengthening of the {Kat\v{e}tov-Tong} insertion theorem},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {357--362},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1993},
     mrnumber = {1241744},
     zbl = {0807.54023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1993__34_2_a17/}
}