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@article{AUCMP_1969__10_1-2_a2, author = {Koman, M.}, title = {On the crossing numbers of graphs}, journal = {Acta Universitatis Carolinae. Mathematica et Physica}, pages = {9--46}, publisher = {mathdoc}, volume = {10}, number = {1-2}, year = {1969}, mrnumber = {0288049}, zbl = {0256.05103}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AUCMP_1969__10_1-2_a2/} }
Koman, M. On the crossing numbers of graphs. Acta Universitatis Carolinae. Mathematica et Physica, Tome 10 (1969) no. 1-2, pp. 9-46. http://geodesic.mathdoc.fr/item/AUCMP_1969__10_1-2_a2/