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References:
[1] M. Behzad G. Chartrand, L. Lesniak-Foster: Graphs & Digraphs. Wadsworth, Belmont, CA (1979). MR 0525578
[2] G. Chartrand F. Saba, H.-B. Zou: Edge rotations and distance between graphs. Čas. pěst. mat. 110 (1985), 87-91. MR 0791281
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