@article{COMIM_2012_20_2_a1,
     author = {Luca, Florian},
     title = {On a problem of {Bednarek}},
     journal = {Communications in Mathematics},
     pages = {79--80},
     year = {2012},
     volume = {20},
     number = {2},
     mrnumber = {3032805},
     zbl = {06165036},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/COMIM_2012_20_2_a1/}
}