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Ershov, A. P.; Kozhukhin, G. I.

Estimates of the chromatic number of connected graphs. (English. Russian original) Zbl 0113.38802

Sov. Math., Dokl. 3, 50-53 (1962); translation from Dokl. Akad. Nauk SSSR 142, 270-273 (1962).
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topology
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\textit{A. P. Ershov} and \textit{G. I. Kozhukhin}, Sov. Math., Dokl. 3, 50--53 (1962; Zbl 0113.38802); translation from Dokl. Akad. Nauk SSSR 142, 270--273 (1962)