@article{CMUC_1962_3_1_a6,
     author = {Hedrl{\'\i}n, Zden\v{e}k},
     title = {On number of commutative mappings from finite set into itself {(Preliminary} communication)},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {32},
     year = {1962},
     volume = {3},
     number = {1},
     mrnumber = {0143708},
     zbl = {0101.25202},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1962_3_1_a6/}
}