[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