@article{CMJ_2008_58_1_a8,
     author = {Carlip, Walter and Mincheva, Martina},
     title = {Symmetry of iteration graphs},
     journal = {Czechoslovak Mathematical Journal},
     pages = {131--145},
     year = {2008},
     volume = {58},
     number = {1},
     mrnumber = {2402530},
     zbl = {1174.05048},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2008_58_1_a8/}
}