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References:
[1] CHARTRAND G., HARARY F.: Planar Permutation Graphs. Ann. Inst. H. Poincaré Sect. B 3, 1967, 483-438. MR 0227041 | Zbl 0162.27605
[2] CHARTRAND G., FRECHEN J. B.: On the Chromatic Number of Permutation Graphs. In: Proof Techniques in Graph Theory. New York 1969, 21-24. MR 0250934 | Zbl 0199.59401
[3] WATKINS M.: A Theorem on Tait Colourings with an Application to the Generalized Peterson Graphs. In: Proof Techniques in Graph Theory, New York 1969. MR 0236062
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