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REFERENCES
| J.-C. Bermond, Ordres a` distance minimum d'un tournoi et graphs partiels sans circuits maximaux, Math. Sci. Hum., No. 37 (1972), 5-25.
K. B. Reid, On sets of arcs containing no cycles in tournaments, Canad. Math. Bull., 12 (1969), 261-264.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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