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References:
[1] F. Harary: Graph Theory. (Addison-Wesley, Reading, Mass., 1969). MR 0256911 | Zbl 0196.27202
[2] S. Říha: Hamiltonian lines in the square of graphs. I. Arch. Math. (Brno) 24 (1988), 45-56. MR 0983222
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