@article{10_1007_s10587_011_0025_y,
     author = {Deng, Guixin and Yuan, Pingzhi},
     title = {Isomorphic digraphs from powers modulo $p$},
     journal = {Czechoslovak Mathematical Journal},
     pages = {771--779},
     publisher = {mathdoc},
     volume = {61},
     number = {3},
     year = {2011},
     doi = {10.1007/s10587-011-0025-y},
     mrnumber = {2853090},
     zbl = {1249.05162},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-011-0025-y/}
}