@article{CMJ_2008_58_1_a3,
     author = {Luca, Florian},
     title = {On the {Euler} function of repdigits},
     journal = {Czechoslovak Mathematical Journal},
     pages = {51--59},
     year = {2008},
     volume = {58},
     number = {1},
     mrnumber = {2402525},
     zbl = {1174.11004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2008_58_1_a3/}
}