List colourings of planar graphs
Discrete Mathematics
Every planar graph is 5-choosable
Journal of Combinatorial Theory Series B
3-list-coloring planar graphs of girth 5
Journal of Combinatorial Theory Series B
A note on the not 3-choosability of some families of planar graphs
Information Processing Letters
A sufficient condition for a planar graph to be 3-choosable
Information Processing Letters
A note on 3-choosability of planar graphs
Information Processing Letters
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It is known that planar graphs without cycles of length 4, i, j, or 9 with 4