Geodesic
New Lower Bound for the Chromatic Number of a Rational Space with One and Two Forbidden Distances
Matematičeskie zametki, Tome 97 (2015) no. 2, pp. 255-261

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A new lower bound for the chromatic number $\chi({\mathbb Q}^n)$ of the space ${\mathbb Q}^n$ is obtained.
Keywords: chromatic number, rational space with forbidden distances, Nelson–Hadwiger problem, independence number of a graph, Stirling's formula. 
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     author = {E. I. Ponomarenko and A. M. Raigorodskii},
     title = {New {Lower} {Bound} for the {Chromatic} {Number} of a {Rational} {Space} with {One} and {Two} {Forbidden} {Distances}},
     journal = {Matemati\v{c}eskie zametki},
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     publisher = {mathdoc},
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     url = {http://geodesic.mathdoc.fr/item/MZM_2015_97_2_a7/}
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E. I. Ponomarenko; A. M. Raigorodskii. New Lower Bound for the Chromatic Number of a Rational Space with One and Two Forbidden Distances. Matematičeskie zametki, Tome 97 (2015) no. 2, pp. 255-261. http://geodesic.mathdoc.fr/item/MZM_2015_97_2_a7/