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@article{ARM_1989__25_1-2_a6, author = {Hell, Pavol and Ne\v{s}et\v{r}il, Jaroslav}, title = {Universality of directed graphs of a given height}, journal = {Archivum mathematicum}, pages = {47--54}, publisher = {mathdoc}, volume = {25}, number = {1-2}, year = {1989}, mrnumber = {1189198}, zbl = {0712.05033}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1989__25_1-2_a6/} }
Hell, Pavol; Nešetřil, Jaroslav. Universality of directed graphs of a given height. Archivum mathematicum, Tome 25 (1989) no. 1-2, pp. 47-54. http://geodesic.mathdoc.fr/item/ARM_1989__25_1-2_a6/