A new 3-color criterion for planar graphs
Krzysztof Diks,
Łukasz Kowalik,
and Maciej Kurowski
Proc. 28th Int. Worksh. Graph-Theoretic Concepts in Computer Science (WG 2002), Lecture Notes in Computer Science 2573, Ludek Kucera, ed., Springer-Verlag, 2002, pp. 138–149
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