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@article{MZ_1967__102_170859, author = {Martin Aigner}, title = {On the {Linegraph} of a {Directed} {Graph.}}, journal = {Mathematische Zeitschrift}, pages = {56--61}, publisher = {mathdoc}, volume = {102}, year = {1967}, zbl = {0158.20901}, url = {http://geodesic.mathdoc.fr/item/MZ_1967__102_170859/} }
Martin Aigner. On the Linegraph of a Directed Graph.. Mathematische Zeitschrift, Tome 102 (1967), pp. 56-61. http://geodesic.mathdoc.fr/item/MZ_1967__102_170859/