Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_1987_17_1a_16, author = {Petrovi\'c Vojislav}, title = {On unavoidable subdigraphs of tournaments}, journal = {Novi Sad Journal of Mathematics}, pages = {229-238}, publisher = {mathdoc}, volume = {17}, number = {1}, year = {1987}, url = {http://geodesic.mathdoc.fr/item/NSJOM_1987_17_1a_16/} }
Petrović Vojislav. On unavoidable subdigraphs of tournaments. Novi Sad Journal of Mathematics, Tome 17 (1987) no. 1. http://geodesic.mathdoc.fr/item/NSJOM_1987_17_1a_16/