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A circulant is a Cayley graph of a cyclic group. Arc-transitive circulants of square-free order are classiied. It is shown that an arc-transitive circulant ? of square-free order n is one of the following: the lexicographic product K b ], or the deleted lexicographic K b ] ? b, where n = bm and is an arc-transitive circulant, or ? is a normal circulant,(More)
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