Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1971__21_3_a5, author = {Zelinka, Bohdan}, title = {The {Decomposition} of a {Digraph} into {Isotopic} {Subgraphs}}, journal = {Mathematica slovaca}, pages = {221--225}, publisher = {mathdoc}, volume = {21}, number = {3}, year = {1971}, mrnumber = {0304230}, zbl = {0223.05110}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1971__21_3_a5/} }
Zelinka, Bohdan. The Decomposition of a Digraph into Isotopic Subgraphs. Mathematica slovaca, Tome 21 (1971) no. 3, pp. 221-225. http://geodesic.mathdoc.fr/item/MASLO_1971__21_3_a5/