Geodesic
A proof of the crossing number of $K_{3,n}$ in a surface
Discussiones Mathematicae. Graph Theory, Tome 27 (2007) no. 3, pp. 549-551

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In this note we give a simple proof of a result of Richter and Siran by basic counting method, which says that the crossing number of K_3,n in a surface with Euler genus ε is
Keywords: crossing number, bipartite graph, surface 
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     title = {A proof of the crossing number of $K_{3,n}$ in a surface},
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Ho, Pak. A proof of the crossing number of $K_{3,n}$ in a surface. Discussiones Mathematicae. Graph Theory, Tome 27 (2007) no. 3, pp. 549-551. http://geodesic.mathdoc.fr/item/DMGT_2007_27_3_a10/