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@article{ARM_1977__13_2_a6, author = {Sap\'ak, Old\v{r}ich}, title = {Representation of the finite directed acyclic graph}, journal = {Archivum mathematicum}, pages = {111--116}, publisher = {mathdoc}, volume = {13}, number = {2}, year = {1977}, mrnumber = {0485517}, zbl = {0373.05041}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1977__13_2_a6/} }
Sapák, Oldřich. Representation of the finite directed acyclic graph. Archivum mathematicum, Tome 13 (1977) no. 2, pp. 111-116. http://geodesic.mathdoc.fr/item/ARM_1977__13_2_a6/