@article{GDZPPN002308010,
title = {A Ramsey-Type Problem for Paths in Digraphs.},
journal = {Mathematische Annalen},
volume = {201},
year = {1973},
pages = {117-118},
zbl = {0239.05119},
url = {http://dml.mathdoc.fr/item/GDZPPN002308010}
}
Williamson, James E. A Ramsey-Type Problem for Paths in Digraphs.. Mathematische Annalen, Tome 201 (1973) pp. 117-118. http://gdmltest.u-ga.fr/item/GDZPPN002308010/