Some remarks on Hajós' conjecture
Journal of Combinatorial Theory Series B
A map colour theorem for the union of graphs
Journal of Combinatorial Theory Series B
Finite dualities and map-critical graphs on a fixed surface
Journal of Combinatorial Theory Series B
5-Coloring Graphs with 4 Crossings
SIAM Journal on Discrete Mathematics
Five-coloring graphs on the Klein bottle
Journal of Combinatorial Theory Series B
A dynamic data structure for counting subgraphs in sparse graphs
WADS'13 Proceedings of the 13th international conference on Algorithms and Data Structures
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