A Ramsey-type problem in directed and bipartite graphs
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Tài liệu tham khảo
L. Gerencsér andA. Gyárfás, On Ramsey-type problems,Ann. Univ. Sci. Budapest. Eötvös Sect. Math. 10 (1967), 167–170.
L. Rédei, Ein kombinatorischer Satz,Acta Sci. Math. (Szeged)7 (1934), 39–43.
T. Gallai, On directed paths and circuits,Theory of Graphs (Proc. Colloq., Tihany, 1966), New York, 1968, 115–118.