@article{106965,
author = {Old\v rich Sap\'ak},
title = {Representation of the finite directed acyclic graph},
journal = {Archivum Mathematicum},
volume = {013},
year = {1977},
pages = {111-116},
zbl = {0373.05041},
mrnumber = {0485517},
language = {en},
url = {http://dml.mathdoc.fr/item/106965}
}
Sapák, Oldřich. Representation of the finite directed acyclic graph. Archivum Mathematicum, Tome 013 (1977) pp. 111-116. http://gdmltest.u-ga.fr/item/106965/