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@article{MAN_1973__203_162432, author = {James E. Williamson}, title = {A {Ramsey-Type} {Problem} for {Paths} in {Digraphs.}}, journal = {Mathematische Annalen}, pages = {117--118}, publisher = {mathdoc}, volume = {203}, year = {1973}, zbl = {0239.05119}, url = {http://geodesic.mathdoc.fr/item/MAN_1973__203_162432/} }
James E. Williamson. A Ramsey-Type Problem for Paths in Digraphs.. Mathematische Annalen, Tome 203 (1973), pp. 117-118. http://geodesic.mathdoc.fr/item/MAN_1973__203_162432/