@article{CMUC_1971__12_3_a3,
     author = {Goral\v{c}{\'\i}k, Pavel},
     title = {One remarkable property of the bicyclic semigroup},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {503--518},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {1971},
     mrnumber = {0289686},
     zbl = {0236.20049},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1971__12_3_a3/}
}