%0 Journal Article
%A Pierre Aboulker
%A Pierre Charbit
%A Reza Naserasr 	
%T Extension of Gyárfás-Sumner conjecture to digraphs
%J The electronic journal of combinatorics
%D 2021
%V 28
%N 2
%U http://geodesic.mathdoc.fr/articles/10.37236/9906/
%R 10.37236/9906
%F 10_37236_9906