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2. The complexity of planar graph choosability;Gutner;Discrete Math.,1996
3. Graph Coloring Problems;Jensen,1995
4. New trends in the theory of graph colorings: choosability and list coloring Contemporary Trends in Discrete Mathematics Štiřin Castle, 1997, DIMACS Ser. Discrete Math. Theoret. Comput. Sci. 49;Kratochvı́l,1999
5. The 4-choosability of plane graphs without 4-cycles;Lam;J. Comb. Theory Ser. B,1999