Five-coloring graphs on the torus
Journal of Combinatorial Theory Series B
Every planar graph is 5-choosable
Journal of Combinatorial Theory Series B
Journal of Combinatorial Theory Series B - Special issue: dedicated to Professor W. T. Tutte on the occasion of his eightieth birthday
Color-critical graphs on a fixed surface
Journal of Combinatorial Theory Series B - Special issue: dedicated to Professor W. T. Tutte on the occasion of his eightieth birthday
A Linear Time Algorithm for Embedding Graphs in an Arbitrary Surface
SIAM Journal on Discrete Mathematics
Computers and Intractability: A Guide to the Theory of NP-Completeness
Computers and Intractability: A Guide to the Theory of NP-Completeness
Some remarks on Hajós' conjecture
Journal of Combinatorial Theory Series B
Graphs, Algorithms and Optimization
Graphs, Algorithms and Optimization
Triangulations and the Hajós conjecture
Journal of Graph Theory
6-Critical Graphs on the Klein Bottle
SIAM Journal on Discrete Mathematics
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We exhibit an explicit list of nine graphs such that a graph drawn in the Klein bottle is 5-colorable if and only if it has no subgraph isomorphic to a member of the list.