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@article{ELMA_1951__6_140566, author = {Oystein Ore}, title = {A problem regarding the tracing of graphs.}, journal = {Elemente der Mathematik}, pages = {49--53}, publisher = {mathdoc}, volume = {6}, year = {1951}, zbl = {0043.38503}, url = {http://geodesic.mathdoc.fr/item/ELMA_1951__6_140566/} }
Oystein Ore. A problem regarding the tracing of graphs.. Elemente der Mathematik, Tome 6 (1951), pp. 49-53. http://geodesic.mathdoc.fr/item/ELMA_1951__6_140566/