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"Circular mixed hypergraphs II: The upper chromatic number."
Vitaly I. Voloshin, Heinz-Jürgen Voss (2006)
- Vitaly I. Voloshin, Heinz-Jürgen Voss:
Circular mixed hypergraphs II: The upper chromatic number. Discret. Appl. Math. 154(8): 1157-1172 (2006)
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