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"The categorical product of two 5-chromatic digraphs can be 3-chromatic."
Stéphane Bessy, Stéphan Thomassé (2005)
- Stéphane Bessy, Stéphan Thomassé:
The categorical product of two 5-chromatic digraphs can be 3-chromatic. Discret. Math. 305(1-3): 344-346 (2005)
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