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"Acyclic Homomorphisms and Circular Colorings of Digraphs."
Tomás Feder, Pavol Hell, Bojan Mohar (2003)
- Tomás Feder, Pavol Hell, Bojan Mohar:
Acyclic Homomorphisms and Circular Colorings of Digraphs. SIAM J. Discret. Math. 17(1): 161-169 (2003)
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