Geodesic
Some necessary conditions for a polynomial to be chromatic
Diskretnaya Matematika, Tome 13 (2001) no. 1, pp. 73-77.

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Two necessary conditions for a polynomial to be chromatic, which in a series of cases are stronger than some known conditions, are suggested. 
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V. A. Voblyi. Some necessary conditions for a polynomial to be chromatic. Diskretnaya Matematika, Tome 13 (2001) no. 1, pp. 73-77. http://geodesic.mathdoc.fr/item/DM_2001_13_1_a3/

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