Transversals of circuits in the lexicographic product of directed graphs
Mathématiques et sciences humaines, Tome 51 (1975), pp. 43-45. 
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     author = {Thomassen, Carsten},
     title = {Transversals of circuits in the lexicographic product of directed graphs},
     journal = {Math\'ematiques et sciences humaines},
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     publisher = {Ecole Pratique des hautes \'etudes, Centre de math\'ematique sociale et de statistique},
     volume = {51},
     year = {1975},
     mrnumber = {392659},
     zbl = {0315.05109},
     language = {en},
     url = {http://www.numdam.org/item/MSH_1975__51__43_0/}
}
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Thomassen, Carsten. Transversals of circuits in the lexicographic product of directed graphs. Mathématiques et sciences humaines, Tome 51 (1975), pp. 43-45. http://www.numdam.org/item/MSH_1975__51__43_0/

[1] Bermond J.C., "Ordres à distance minimum d'un tournoi et graphes partiels sans circuits maximaux", Math. Sci. hum., 37 (1972), 5-25. | Numdam | MR | Zbl

[2] Bermond J.C., "The circuit hypergraph of a tournament", Proc. Colloquia Mathematica Societatis János Bolyai, Infinite and finite sets, Keszthely (Hungary), (1973), 165-180. | MR | Zbl