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"The number of 4-cycles in triangle-free oriented graphs."
Shinsei Tazawa, Chiê Nara, John W. Moon (1995)
- Shinsei Tazawa, Chiê Nara, John W. Moon:
The number of 4-cycles in triangle-free oriented graphs. Discret. Math. 143(1-3): 287-291 (1995)

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