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References:
[1] F. Harary: Problem 16. p. 161, Theory of Graphs and Its Applications, edited by M. Fiedler, Czechoslovak Academy of Sciences, Prague 1964.
[2] F. Harary: Graph Theory. Addison-Wesley, Reading, Mass. 1969. MR 0256911 | Zbl 0196.27202
[3] F. Harary R. M. Karp, W. T. Tutte: A Criterion for Planarity of the Square of a Graph. J. Combinatorial Theory 2 (1967), 395-405. MR 0216976
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