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Suvorov, P. Yu. Representation of proofs by colored graphs and the Hadwiger conjecture. (English) Zbl 0494.05022 J. Sov. Math. 20, 2376-2381 (1982). MSC: 05C15 03B10 PDFBibTeX XMLCite \textit{P. Yu. Suvorov}, J. Sov. Math. 20, 2376--2381 (1982; Zbl 0494.05022) Full Text: DOI
Kozyrev, V. P. Graph theory. (English) Zbl 0287.05101 J. Sov. Math. 2, 489-519 (1974). MSC: 05Cxx 05-02 PDFBibTeX XMLCite \textit{V. P. Kozyrev}, J. Sov. Math. 2, 489--519 (1974; Zbl 0287.05101) Full Text: DOI