@article{CMUC_1960__1_4_a0,
     author = {Pt\'ak, Vlastimil},
     title = {Ueber einen {Typ} von {Saetzen} ueber abgeschlossene {Abbildungen}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {3--7},
     publisher = {mathdoc},
     volume = {01},
     number = {4},
     year = {1960},
     language = {ge},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1960__1_4_a0/}
}