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References:
[1] F. Harary: Graph Theory. Addison-Wesley, Reading, Mass. 1969. MR 0256911 | Zbl 0196.27202
[2] R. E. Nettleton: Some Generalized Theorems on Connectivity. Canad. J. Math. XII (1960), 546-554. MR 0140093 | Zbl 0097.39002
[3] M. E. Watkins: A Lower Bound for the Number of Vertices of a Graph. Amer. Math. Monthly 74 (1967), 297. DOI 10.2307/2316031 | MR 0207592 | Zbl 0147.42901
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