@article{CMJ_2001__51_2_a2,
     author = {Chao, Chong-Yun and Han, Shaocen},
     title = {On the toughness of cycle permutation graphs},
     journal = {Czechoslovak Mathematical Journal},
     pages = {239--260},
     publisher = {mathdoc},
     volume = {51},
     number = {2},
     year = {2001},
     mrnumber = {1844308},
     zbl = {0977.05073},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2001__51_2_a2/}
}