@article{CMUC_1966_7_2_a0,
     author = {Goral\v{c}{\'\i}k, Pavel},
     title = {An example concerning small changes of commuting functions},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {123--126},
     year = {1966},
     volume = {7},
     number = {2},
     mrnumber = {0197625},
     zbl = {0142.02302},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1966_7_2_a0/}
}