@article{BMMS_2001_24_1_a9,
     author = {Chong-Yun Chao},
     title = {Uniquely {N-colorable} and {Chromatically
}                        {Equivalent} {Graphs}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2001},
     volume = {24},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2001_24_1_a9/}
}