@article{CMUC_2007__48_1_a3,
     author = {Somer, Lawrence and K\v{r}{\'\i}\v{z}ek, Michal},
     title = {On semiregular digraphs of the congruence $x^k\equiv y \pmod n$},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {41--58},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {2007},
     mrnumber = {2338828},
     zbl = {1174.05058},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2007__48_1_a3/}
}