@article{CMUC_2011_52_3_a3,
     author = {Ahmad, Uzma and Husnine, Syed},
     title = {Characterization of power digraphs modulo $n$},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {359--367},
     year = {2011},
     volume = {52},
     number = {3},
     mrnumber = {2843229},
     zbl = {1249.11002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2011_52_3_a3/}
}