On the complexity of H-coloring
Journal of Combinatorial Theory Series B
Five-coloring graphs on the torus
Journal of Combinatorial Theory Series B
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
Graph Minors. XX. Wagner's conjecture
Journal of Combinatorial Theory Series B - Special issue dedicated to professor W. T. Tutte
Universal partial order represented by means of oriented trees and other simple graphs
European Journal of Combinatorics
Journal of Combinatorial Theory Series B
Minimal universal and dense minor closed classes
European Journal of Combinatorics - Special issue on Eurocomb'03 - graphs and combinatorial structures
Grad and classes with bounded expansion III. Restricted graph homomorphism dualities
European Journal of Combinatorics
Hadwiger's conjecture is decidable
Proceedings of the forty-first annual ACM symposium on Theory of computing
A New Proof of the $H$-Coloring Dichotomy
SIAM Journal on Discrete Mathematics
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Let K be a class of graphs. A pair (F,U) is a finite duality in K if U@?K, F is a finite set of graphs, and for any graph G in K we have G=