Geodesic
A Note on Graphs of Dichromatic Number 2
Discrete mathematics & theoretical computer science, Tome 22 (2020-2021) no. 4.

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Neumann-Lara and Škrekovski conjectured that every planar digraph is 2-colourable. We show that this conjecture is equivalent to the more general statement that all oriented K_5-minor-free graphs are 2-colourable.
DOI : 10.23638/DMTCS-22-4-11
Classification : 05C10, 05C15, 05C20, 05C83 
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     title = {A {Note} on {Graphs} of {Dichromatic} {Number} 2},
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     url = {http://geodesic.mathdoc.fr/articles/10.23638/DMTCS-22-4-11/}
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Steiner, Raphael. A Note on Graphs of Dichromatic Number 2. Discrete mathematics & theoretical computer science, Tome 22 (2020-2021) no. 4. doi : 10.23638/DMTCS-22-4-11. http://geodesic.mathdoc.fr/articles/10.23638/DMTCS-22-4-11/

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