@article{CMUC_1963__4_4_a4,
     author = {Hedrl{\'\i}n, Zden\v{e}k and Pultr, Ale\v{s}},
     title = {Remark on topological spaces with given semigroups},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {161--163},
     publisher = {mathdoc},
     volume = {04},
     number = {4},
     year = {1963},
     mrnumber = {0166768},
     zbl = {0151.30904},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1963__4_4_a4/}
}