@article{107338, author = {Pavol Hell and Jaroslav Ne\v set\v ril}, title = {Universality of directed graphs of a given height}, journal = {Archivum Mathematicum}, volume = {025}, year = {1989}, pages = {47-54}, zbl = {0712.05033}, mrnumber = {1189198}, language = {en}, url = {http://dml.mathdoc.fr/item/107338} }
Hell, Pavol; Nešetřil, Jaroslav. Universality of directed graphs of a given height. Archivum Mathematicum, Tome 025 (1989) pp. 47-54. http://gdmltest.u-ga.fr/item/107338/
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