@article{CMUC_1963__4_3_a4,
     author = {Proch\'azka, Ladislav},
     title = {A generalization of a theorem of {R.} {Baer}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {105--108},
     publisher = {mathdoc},
     volume = {04},
     number = {3},
     year = {1963},
     mrnumber = {0178067},
     zbl = {0135.06101},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1963__4_3_a4/}
}