Geodesic
The projective plane crossing number of the circulant graph C(3k;{1,k})
Discussiones Mathematicae. Graph Theory, Tome 32 (2012) no. 1, pp. 91-108

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In this paper we prove that the projective plane crossing number of the circulant graph C(3k;1,k) is k-1 for k ≥ 4, and is 1 for k = 3.
Keywords: crossing number, circulant graph, projective plane 
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     title = {The projective plane crossing number of the circulant graph {C(3k;{1,k})}},
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Ho, Pak. The projective plane crossing number of the circulant graph C(3k;{1,k}). Discussiones Mathematicae. Graph Theory, Tome 32 (2012) no. 1, pp. 91-108. http://geodesic.mathdoc.fr/item/DMGT_2012_32_1_a7/