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@article{DMGT_2007_27_3_a10, author = {Ho, Pak}, title = {A proof of the crossing number of $K_{3,n}$ in a surface}, journal = {Discussiones Mathematicae. Graph Theory}, pages = {549--551}, publisher = {mathdoc}, volume = {27}, number = {3}, year = {2007}, language = {en}, url = {http://geodesic.mathdoc.fr/item/DMGT_2007_27_3_a10/} }
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/
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