@article{CMUC_1978_19_4_a9,
     author = {Ml\v{c}ek, Josef},
     title = {A note on cofinal extensions and segments},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {727--742},
     year = {1978},
     volume = {19},
     number = {4},
     mrnumber = {518184},
     zbl = {0398.03020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1978_19_4_a9/}
}