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References:
[1] Berge C.: Theorie des graphes et ses applications. Paris 1958. MR 0155312
[2] Frink O.: A Proof of Petersen's Theorem. Ann. Math. 27 (1926), 491-493. MR 1502751
[3] Kőnig D.: Theorie der endlichen und unendlichen Graphen. Leipzig 1936.
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