theory, Petersen's theorem, named after Julius Petersen, is one of the earliest results in graph theory and can be stated as follows: Petersen's Theorem...

"Une condition suffisante d'existence d'un circuit hamiltonien dans un graphe orienté", Journal of Combinatorial Theory, Series B, 14 (2): 137–147, doi:10...

1016/0196-6774(86)90032-5. Sbihi, Najiba (1980), "Algorithme de recherche d'un stable de cardinalité maximum dans un graphe sans étoile", Discrete Mathematics (in French)...