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Hell, P. Rigid undirected graphs with given number of vertices. (English) Zbl 0167.22101 Commentat. Math. Univ. Carol. 9, 51-69 (1968). PDFBibTeX XMLCite \textit{P. Hell}, Commentat. Math. Univ. Carol. 9, 51--69 (1968; Zbl 0167.22101) Full Text: EuDML