Geodesic
Estimates of the chromatic number of connected graphs
Doklady Akademii Nauk, Tome 142 (1962) no. 2, pp. 270-273.

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     author = {A. P. Ershov and G. I. Kozhukhin},
     title = {Estimates of the chromatic number of connected graphs},
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     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_142_2_a2/}
}
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A. P. Ershov; G. I. Kozhukhin. Estimates of the chromatic number of connected graphs. Doklady Akademii Nauk, Tome 142 (1962) no. 2, pp. 270-273. http://geodesic.mathdoc.fr/item/DAN_1962_142_2_a2/