Geodesic
On the toughness of cycle permutation graphs
Czechoslovak Mathematical Journal, Tome 51 (2001) no. 2, pp. 239-260.

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Motivated by the conjectures in [11], we introduce the maximal chains of a cycle permutation graph, and we use the properties of maximal chains to establish the upper bounds for the toughness of cycle permutation graphs. Our results confirm two conjectures in [11].
Classification : 05C40, 05C58
Keywords: cycle permutation graph; toughness; maximal chain 
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     author = {Chao, Chong-Yun and Han, Shaocen},
     title = {On the toughness of cycle permutation graphs},
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     pages = {239--260},
     publisher = {mathdoc},
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     zbl = {0977.05073},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2001__51_2_a2/}
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Chao, Chong-Yun; Han, Shaocen. On the toughness of cycle permutation graphs. Czechoslovak Mathematical Journal, Tome 51 (2001) no. 2, pp. 239-260. http://geodesic.mathdoc.fr/item/CMJ_2001__51_2_a2/